TactiSMART 012: DIY AR/ASG 20mm aka 12-Gauge Shotgun "Master Key"

Even a small 60-round drum for Maximum Rounds Start (MRS) cannot be used as a pistol grip for an ASG, so this combo has the latter with its own grip 

As stated earlier in our look at the John Wick GUNgfu movies, if one were to unwisely enter short-range, firefight melees where there isn't even time to unsling a back-up weapon from your back, your 2nd back-up gun must be already ON the primary gun so if it runs dry you just aim & squeeze a second trigger. Never just bring 1 gun in your hands to a melee fight! If the Hollywood movie on the Benghazi debacle "13 Hours: The Secret Soldiers of Benghazi" is accurate, a supposed "expert" lost his 40mm Grenade Launcher (GL) while slung at his back--robbing the defenders the ability to indirect fire-reach Islamothugs--resulting in friendly casualties. 

OPTION: 40mm GL Pistol in Huge-Ass Holster

Huge Holster for 40mm GL Pistol

Seen in the SEALs TV show, the M320 40mm GL can be carried like a huge pistol instead of slung across your back. Note the retention cord! It still takes more time--precious seconds to present from the holster compared to if the GL was mounted under the AR. 

https://www.ebay.com/itm/MMI-Outdoor-War-Belt-Holster-Multicam-M320-Battle-Belt-CAG-SEAL-SOF-DEVGRU/303436472604?hash=item46a639211c:g:oFUAAOSwm11eFPge

MMI Outdoor M320 Grenade Launcher Holster System.

Condition: New

Included =  M320 Grenade Launcher Holster, Weapon Leash, and War Belt

Developed in response to a need from the field for a tough and intuitive way to carry the M320, the complete M320 Grenade Launcher Holster System consists of the M320 Grenade Launcher Holster, Weapon Leash, and War Belt. 

The M320 Grenade Launcher Holster (GLH) is a semi-rigid, open-topped holster. The weapon slides into place and is secured by a self locking trigger guard clip (seen below). Secondary retention is available with an elastic tubular webbing top strap and side release buckle featuring MMI’s G-tab. the G-tab is a proprietary webbing extension that allows for easy closure of the buckle even when the user is wearing gloves. The completely open top allows any standard optics to be attached to the M320 and still fit easily into the holster. The trigger guard clip is easily field replaceable with a single screw in the unlikely event of breakage in the field. MOLLE allows the GLH to be attached anywhere based on user preference.

Dummy corded!

The Weapon Leash is a single point harness for an M320. The user can simply girth hitch the loop end of the leash onto their chest rig or harness at a point that is comfortable for them. ITW’s MASH hook at the opposite end allows for easy attachment of the leash to the rear of the grenade launcher. This allows the weapon to be used accurately and safely without the buttstock offering considerable weight savings.

The final piece to this capability is the MMI Outdoor War Belt. It is a combination of an outer MOLLE belt and an inner rigger’s belt creating a supplemental load carriage system. The MOLLE belt is contoured to fit natural motion and add lumbar support to help reduce fatigue on a long movement much like a weight lifter’s belt. The Rigger’s belt allows the system to fit waist sizes from 30 to 40 inches and securely hold the load in place.

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The U.K. Army has not tried to under-mount a 20mm/12 gauge shotgun under its infamous SA80-type bullpups like it has done with a 40mm GL; using a stand-alone, gas-operated, 9-pound, 7-shot + 1, Benelli Super 90 shotgun slung at the back--and is not happy with the arrangement. 

The Stand-Alone ShotGun: Worth the Weight & Heft?

https://en.wikipedia.org/wiki/Section_(military_unit)#World_War_II_and_the_Cold_War

The L128A1 combat shotgun was introduced for use by the section point man, with this position subject to rotation within the section to avoid excessive stress for individual Soldiers.^[14]

https://en.wikipedia.org/wiki/Benelli_M4

7+1 (Military, LE) internal tube
Mass 3.82 kg (8.42 lb)
Length 889 mm (35.0 in) (stock retracted)
1,010 mm (40 in) (stock extended)
Barrel length
470 mm (18.5 in)

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Joining in the stand-alone weapon stupidity when supplementary weapons could be minimally attached under a primary weapon, with the 9-pound, M4/M1014 is the U.S. moron corps (USMC) that also adds another 12 pounds of slung-at-the-back weight with the Milkor M32, 6-shot, stand-alone, 40mm GL. Its like Vietnam and the M79 stand-alone GL woes never happened. Civilian gun normies do 3-Gun competitions interchangeably shooting pistol, rifle & shotgun--each independent when the rifle & shotgun should be 1 integrated unit--an Assault Rifle/Assault ShotGun (AR/ASG) combo.  

3-Gun Shooting Contests

https://blog.cheaperthandirt.com/gear-3-gun/

This also begs the question of why not instead carry beaucoup bullet-trap, Rifle Grenades (RGs) that launch from rifle barrels and not need special launchers. Cleverly-designed RGs could also be thrown like "stick" hand grenades farther than baseball-type hand grenades. 

combatreform.org/riflehandgrenades.htm

If launchers are needed for more precision direct hits albeit at less High Explosive (HE) effects, carry them under your rifle platform so they are less likely to be lost as the 1960s U.S. ARMY Firepower Project concluded with the minimalist XM148 and M203 GLs designed by ARES Industries mounting under the M16 Assault Rifle (AR). 

Carry 2 in your hands; make it a small 20mm aka 12-gauge shotgun mounted under your AR--in essence, an Assault ShotGun (ASG). This way even during primary gun re-loading, you are not without firepower. Knight Armaments lead the way with its Master Key concept using a shortened Remington 870 to breach doors.

https://www.youtube.com/watch?v=Ls_CUS2whe4

A Mossberg 500 and AR15 combination was featured in the 1st Predator movie in 1987 carried by Sonny Landham (Billy):

http://www.imfdb.org/wiki/Predator_(1987)

Billy's AR-15/SP1 is fitted with an underbarrel Mossberg 500. While never shown prominently firing the shotgun, there is a brief instance where he appears to run out of ammo for his rifle, and fires off a single shot before the film cuts to the next scene. It is often overlooked as he is in the background in this scene and there is no sound effect for his shotgun firing. He is also seen pumping his shotgun closed after the men cut down the forest with weapons fire, implying he had been firing it during that scene. In the original screenplay, Billy's SP1 rifle was to be fitted with an M203 launcher. During the helicopter scene, he was to be seen opening and closing the breech repeatedly.

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James Bond or John Wick 4's NEW GUN: an AR/ASG Combo--CHINA Offers a Master Key Candidate

As you probably know, nearly all U.S. Military (USMIL) hand weapons have Picatinny Rails (Pic Rails) to attach night/reflex collimator red dot sights (We got them adopted by the Army/marines combatreform.org/nightvision.htm), visible/invisible laser pointers, flashlights, grips, bipods etc. Our latest invention exploits the Pic Rail to attach an ASG under the standard AR15/M16/M4 rifle/carbine to act as a "Master Key" to shoot-off door knob cross bolts--as well as 20mm/12 gauge large caliber, firepower out to 50 meters that the very fast--but tiny--AR bullet cannot do. Using a COTS, 6-pound, tube-fed, pump-action, ATI MB3R 12-gauge shotgun (stock removed) with Pic Rails we combined the two gun types into an AR/ASG for under $150 (see pic). The 30-round AR magazine acts as the shotgun's pistol grip. The USMIL uses a $3, 000 specially-attached, magazine-fed but bolt-action CMORE M26 shotgun under its AR15/M16/M4s that is 3 pounds lighter---but at the trade-off of barrel length loss so its NOT a firepower addition beyond 20 meters and more of just a door breacher. Moreover, with our pump-action shotgun we can retract the slide instantly upon firing to negate recoil--with the bolt-action shotgun you take in ALL of the recoil. I learned this at the USMC Security Force Cadre Instructor's Course derived from Jeff Cooper's GUNSITE school. 

Slide Retraction Recoil Mitigation Technique    

Tactical Shotgun Tips: Use Recoil to Your Advantage

https://www.youtube.com/watch?v=SSdJM5T165Y

USA AMMO Shotgun: Combat Loading

https://www.youtube.com/watch?v=j7AjaNwtKww

The 4" inches of shotgun barrel overhang could be cut-off at the loss of range and needing a permit from ATF--but certainly the last inch should be a welded-on, M22/0.75" threaded flash hider.

Our AR/ASG can be instantly attached/detached as needed and used separately as a pistol grip shotgun slung at the back--but the CIA/SEALs during the Benghazi fiasco lost their 40mm grenade launcher this way and then didn't have any indirect fire weapons to silence the enemy mortars that killed 4 of them on the rooftop. 

Thanks to socialist Marxist Hedonist disarmament attacks on American's God-given, intrinsic right to gun self-defense, the prices of even mass-produced, prevalent 12-gauge (.081 inch, 20mm diameter) shotguns primarily for wildgame hunters has gone up. 

Enter the ATI MB3R pump-action, 12-gauge shotgun from the Chinese Communists (CHICOMs) who have about 1 billion too many people to cloth, house, feed and supply a marriage partner to--hence the Coronovirus panic-epidemic blamed ostensibly on the individual Oriental citizen's penchant for putting disgusting things in their noodles and eating it: re Disney Pixar's "Bao" cartoon where mom eats dumpling-based son because he's dating a sexy, Occidental breasty hot chick from the West:

Bao (Barrf!)

https://www.youtube.com/watch?v=cB_2qU4GLCw

However, it's more likely--and there is evidence that shows it--the Wuhan city, COVID19 virus is a bio-weapon from the Communist government--to depopulate their masses since stealthily taking over Australia--whose women are not attracted to Asian men--and has lots of wildfires to put out due to naive climate change hysterics is not working out. 

One of the many widgets the pinko Chinese capitalists are good at making are WEAPONS--some of whom are superior to the complacent west like their High Water Speed (HWS) amphibious tracked tanks all done at far less costs than what our corrupt & greedy MILINDCOMP offers and failed to create re: the USMC GDLS EFV failure. 

One such low-cost weapon the CHICOMS certainly hope Americans will kill lots of fellow Americans with, is their under $150 price range, MB3R tube-feed, 4-Round pump-action, 12-gauge Shotgun with Top Picatinny Rail--which can be used as an attachment point for mounting it under an AR15/M16/M4 AR. Interestingly, the bottom Pic rail can be used to attach a foregrip bipod so your AR/MK combo can be sustain-fired from the prone! There are indeed, PRELoaded Magazine-fed (PRLEM) & dependent, 12-gauge shotguns that can also connect under AR15/M16/M4s as Master Keys--but they are actually heavier than tube-fed shotguns except for the cut-down barrel, Any Other Weapons (AOWs) versions requiring one to mother may I? ask the ATF bureaucracy to let you own one, pay-a-fee and get placed on a gun confiscation/arrest/throw-in-death-camp, computer database. The 26" plus long MB3R with stock removed, 18.5" barrel doesn't need anyone's permission to attach under an AR15/M16/M4 rifle/carbine since its legal in its own configuration.   

Field Test

MRS 40-round box magazine as pistol grip for MB3R ASG

We obtained a MB3R (removed its stock) and a pair of BestGuarder SYA-101 Picatinny Female-to-Female clamps: 

2 x SYA-101 Adapters to Securely Fit a Picatinny Top Rail Shotgun to the underside of an AR-15/M16/M4

ebay.com%2Fitm%2FBestguarder-SYA-101-Picatinny-to-Picatinny-Rail-Mount-Clamp-Adapter-%2F392277398443&psig=AOvVaw04pp6UtuqasYofF_niWXmS&ust=1581167574171000&source=images&cd=vfe&ved=0CA0QjhxqFwoTCOj_rrfCv-cCFQAAAAAdAAAAABAE

https://www.ebay.com/itm/Bestguarder-SYA-101-Picatinny-to-Picatinny-Rail-Mount-Clamp-Adapter-/392277398443

https://www.google.com/url?sa=i&url=https%3A%2F%2Fwww.ebay.com%2Fitm%2FBestguarder-SYA-101-Picatinny-to-Picatinny-Rail-Mount-Clamp-Adapter-%2F392277398443&psig=AOvVaw04pp6UtuqasYofF_niWXmS&ust=1581167574171000&source=images&cd=vfe&ved=0CA0QjhxqFwoTCOj_rrfCv-cCFQAAAAAdAAAAABAE

https://www.ebay.com/p/5029029353

Bestguarder SYA-101 Picatinny to Picatinny Rail Mount Clamp Adapter
1 product rating 
Seller : dxmbestbuy (2126 ) 99.5% Positive feedback

About the product

Picatinny to picatinny rail clamp adapter
Made from aluminum and deep anodized black
Can be used on anything with a standard picatinny rail
Positive metal to metal contact --- weaver rail compatible

Product description

This picatinny to picatinny clamp allows for positive connection between two picatinny rails. Will work with any standard picatinny rail and weaverrail compatible! Remarks: It is compatible with Bestguarder NV-600 and WG-50 for mounting them to the weaver rail.
    
99% of the items will be fullfilled within 1 Business Day.Any questions, please feel free to contact me.

https://www.ebay.com/itm/Bestguarder-SYA-101-Picatinny-to-Picatinny-Rail-Mount-Clamp-Adapter/372909922929?_trkparms=aid%3D333200%26algo%3DCOMP.MBE%26ao%3D1%26asc%3D20171012094517%26meid%3D14ce651faf5f445daf0b2ed7665d7413%26pid%3D100008%26rk%3D1%26rkt%3D12%26sd%3D392277398443%26itm%3D372909922929%26pmt%3D1%26noa%3D0%26pg%3D2047675&_trksid=p2047675.c100008.m2219

https://www.amazon.com/Bestguarder-SYA-101-Picatinny-Mount-Adapter/dp/B07H7ZD4HD

$13.99

FREE Shipping  on orders over $25.00 shipped by Amazon or get Fast, Free Shipping with Amazon Prime & FREE Returns 
Want it Sunday, Feb. 9? Order within 5 hrs 48 mins and choose Two-Day Shipping at checkout. 

Details

In Stock.

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We already had a Pic quad-rail at the barrel to DIY mount the stock-less, MB3R under our generic AR15A2/M16A2 clone for field test. Clamp-on a vise grip plier claws onto the Best Guarder adapter knobs and TIGHTEN THEM AS HARD AS YOU HUMANLY CAN so they cannot even turn clock-wise anymore so the ASG can't move during handling & firing. A Green Laser/TacFlashlight was attached to the right side rail for right support hand, rear button activation (I'm a lefty). A grip bipod was attached to the pump action's handguard rail for faster cycling of the action and prone-firing.  

You may want to attach a pistol grip to the MB3R Master Key for a QD use-on-its-own option. You can also create a more minimalist, metal wire pistol grip screwed into the MB3R's "Receiver Stud". Like the Sten Sub-Machine Gun's wire pistol grip or the ATI plastic one or depicted at the top of this page.

https://www.sarcoinc.com/sten-mk5-commando-grip/

Sten MK5 Commando Grip

Item Number STN111      No reviews yet   Write A Review
$24.95

DESCRIPTION

Steel grips as used in WW2 to make the Sten MK5 SMG even shorter for close in fighting and Para operations. Easily attaches in seconds by sliding the stock off of the receiver and sliding the grip in place to be locked in by the buffer cup. Very limited quantity.

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https://www.combathunting.com/American_Tactical_MB3_Shotgun-ATI_MB3_Shotgun_T3_Rear_Pistol_Grip.html

SKU: MB3-RPG0100 
MPN: ATI-RPG0100 
UPC: 758152484551

This ATI T3 Pistol Grip fits most 12/20 Gauge American Tactical MB3 Pump-Action S-Beam Shotguns. The ATI rear pistol grip is a non-slip textured. This tactical shotgun pistol grip has recoil reduction material and a QD sling attachment point at the rear of the grip so it can be used with a singl point bungee sling slung over your shoulder. Pistol grip securely fasten to your tactical shotgun with no specialized tools. Adapters mounts included for all supported models in one package and all mounting hardware included. Grip Made from Dupont extreme reinforced polymer. Manufactured in the USA by Advanced Technology International Limited Lifetime Warranty.

Fits: Most 12/20-Guage Mossberg 500/535/590/835 Maverick 88, Remington 870/887/7400, Winchester SXP, FNH USA P-12, Most Savage Stevens 320 prior to 2016, TriStar Raptor/Cobra & Tec 12, Charles Daly 301 Pump-Action Field Shotgun 12 ga, American Tactical MB3 Pump-Action Shotguns.

Note Grip Will Fit Most 20 Gauge Shotgun Models Listed But It Will Be (Protruding Slightly At The Rear Due to 20 gauge Receiver Dimensions Are Smaller).

We Recommend A Single Point QD Bungee Sling To Go With The Rear Pistol Grips QD Sling Mount A.5.10.2542.

Regular Price: $59.99
Sale Price: $39.99
You Save: $20.00

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FIELD TEST UPDATE: ASG Travel STOP

Back-side of MB3R ASG showing newly-attached TRAVEL STOP

We found even with Pic rail adapters tightened as much as humanly possible, that the ASG can slide back into the magazine acting as its pistol grip. To prevent this, we added a TRAVEL STOP by cutting a door bolt plate and using the MB3R's pistol grip nut to secure it with a thin washer. Pic above is before it was flat black spray paint-camouflaged. 

Put on the Brakes!

The MB3R rail-mounted under our 20" long barrel, AR15A2/M16A2 clone only has a 4" barrel stick-out--our only semi-beef with ATI is not having M22 x 0.75" threads on the barrel ends.to easily attach a flash hider/muzzle brake. We say semi-beef because even better would be to cut-off some barrel length and use that length for a flash hider/muzzle brake welded to it so its part of the 18.5" required length. A good gunsmith could do this for your MB3R; an option is the FIMEGROUP's flash hider:

https://fimegroup.com/store/muzzle-attachments/12-gauge-flash-hider.html

There are also clamp-on shotgun brakes but they will add another 1" of barrel length--WITT MACHINE's CO brake:

https://www.wittmachine.net/clamp-on-shotgun-brake.html

Our new clamp-on muzzle brakes have been precision CNC machined from 1 ½ inch 416 stainless and offer a substantial reduction in felt recoil and muzzle rise. A felt recoil reduction of up to 60% or more can be expected; significantly improving comfort during firing, as well as faster follow up shots. 

During testing we found that the 5 port design makes the most efficient use of the available gasses exiting the barrel to substantially reduce recoil. There are 20 .078" holes drilled into the top of the brake that vent gas in order to stop muzzle rise. The bottom of the brakes have no holes or ports to kick up dirt all over the shooter. Having the bottom of the brake angled outward also helps to reduce muzzle rise. After months of testing and development the design of these brakes make them the most efficient clamp on muzzle brakes available today. 

As part of our manufacturing process after the muzzle brakes are machined they are finished with a large vibratory tumbler using Ceramic media in order to provide a smooth matte finish. The brakes can be used as is, or painted/coated with any of the gun coatings commercially available. We also offer Cerakote coating on all of our brakes. 

These new patent pending muzzle brakes require no permanent modification to the original firearm and can be installed using simple hand tools. No gunsmithing required. 

In case of measurement error we do re-cut the brakes at no charge, however, please be as precise as possible in the measuring so we can continue this service for everyone. We ask for barrel measurements at the muzzle and 1 1/2" from the muzzle in thousandths of an inch or hundredths of a mm, to make sure your new brake fits right the first time.

Please see Measuring Information for details.

Our Muzzle Brakes are made to order!

Please allow 5-7 days for your custom order to ship.
You will receive a confirmation email as soon as your order is shipped.
**These Brakes ARE NOT Designed for Ribbed Barrels** 

Warranty / Guarantee

All of our products are 100% guaranteed. If you don't like it for any reason we buy it back, including shipping, no questions asked.

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An ideal PRA Assault ShotGun could be the Keltec 6.5 pound, 10-round, bullpup KSG Tactical Short Barrel Shotgun (SBS) by extending a Picatinny Rail all along its top so it can attach under an AR15/M16/M4....the pump action can mitigate recoil better than the USMIL's CMORE M26 bolt-action mini-shotgun. Its an item requiring ATF AOW approval and retails for $1200.

https://www.youtube.com/watch?v=39sigFoFqII

The longer barrel standard KSG and Compact have longer barrels that don't need ATF tax stamp approval just need a longer Pic rail on top. 

In another TactiSMART article we will tackle the muzzle brake issue; for shotgun door breaching its beneficial to have a muzzle rise compensator aka brake that can be pressed against a door knob or hinge. This will add at least 1" onto the ASG barrel length unless you cut-off the matching compensator length, add threads and then screw & weld it on.  

Carrying the AR/ASG Combo: Beef Up!

You'll have to be strong in your arms to carry the AR/ASG combo which should be assisted by a MAGPUL M2 quick-adjustable sling over your shoulder so its guitar-high on your torso. Let go and the AR/ASG dangles like a banjo. Think "Deliverance's" banjo duel with rifle slings. The NEW Ready Tactical Sling (RTS) holds your AR/ASG muzzle-down in front of your chest. Just lift to shoulder fire!

readytacticalslings.com

You can sling the combo at your back for hands-free, climbing.

Another possibility is turning the AR/ASG VERTICAL and clipping it to your side when you need your hands-free but don't want any flopping around loosely slung at your back.

https://www.copquest.com/blackhawk-stealth-weapons-catch_26-3030.htm

BlackHawk Stealth Weapons Catch
Our Price $29.84 | You Save 17% | Retail $35.95
No: 26-3030

Add to cart

The BlackHawk Stealth Weapons Catch is a new and improved weapons catch designed for the demanding environments of law enforcement and military. The Stealth Weapons Catch is ultra quiet with no velcro or snaps. The robust spring metal construction of the catch guarantees years of reliable performance in the harshest of conditions. The Stealth Weapons Catch can secure shotguns, rifles, less-than-lethal weapons and manual entry tools.

Stealth Weapons Catch by BlackHawk 

Features:

• Quiet, adjustable & removable elastic weapon retention strap
• Ambidextrous design
• Includes 2 BLACKHAWK! Speed Clips
• MOLLE web attachment
• 2 metal A.L.I.C.E. Clips for belt mounting
• Spring steel constructed catch
• Designed for rugged and reliable use
• Fast, easy and convenient to use
• Available in Black and Coyote Tan

https://www.copquest.com/blackhawk-cqd-weapons-catch-mark-ii_26-3064.htm

BlackHawk CQD Weapons Catch - Mark II
Our Price $37.68 | You Save 18% | Retail $45.95
No: 26-3064 | Mfg: 71CQD2BK

The BlackHawk CQD Weapon Catch was created specifically for police and military special operations units which provides weapon security and retention while providing immediate access. The Mark II carry rifles, shotguns, submachine guns, tear gas launchers, non-lethal weapons, manual entry tools, and other special-use weapons.

The BlackHawk CQD® Weapon Catch is used in one basic method:

• (II) Retention catch - used for intense physical activity or when total retention is necessary.
BlackHawk CQD Weapon Catch Features:
• Adjustable retaining strap for multiple weapon types
• The Mark II™ also includes a polymer hook for fast clip action and silent operation
• Ambidextrous and compact (one size fits all)
• Compatible with existing equipment systems
• Color: Black

Note: The Mark II includes a silent polymer hook for fast clip action and silent operation.

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Ammo Carry

Having slug shells held by SOFT elastic or HARD plastic loop velcro shot cards on the side of the shotgun is very handy to select them for say door bolt/hinge breaching from the anti-personnel, "00" buckshot already in the action--albeit it's yet more added weight to the AR15/M16 and shotgun combo. Different colors (black, brown coyote, multicam, green ranger) available with the SOFT elastic shot card holders can be for designated different type shells. The ATI MB3R receiver right side--just aft of the chamber opening--can accomodate 3 x 12 gauge rounds. 4 rounds can be accomodated on the left side of the receiver and not interfere with the pump-action slide retraction's grip. 1 round in the gun, plus 4 in the tube is 5 rounds plus the 7 on the sides for a total of 12.  

https://www.midwayusa.com/product/1016205673?pid=183142

MidwayUSA Shotgun Card Black

Product #: 183142 Manufacturer #: 553843 UPC #: 00887217004102

Our Price: $8.99
Available
Ships today from MidwayUSA
Color: Black
Capacity: 7 Round

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If you don't want to cut a MIDWAY USA or ESSTAC 7-round shot card into a baby 3-round (will need a seamstress to re-attach one elastic loop) and 4-round mini-shot cards, you can buy them as small as a 4-rounder from ESSTAC.  One of these 4-rounders would have one elastic loop trimmed off to make a baby 3-round card. 

SOFT Velcro Shotgun Holder/Card: Fast Reloads, Lots of Ammo

https://www.youtube.com/watch?v=vTkT0_Fz0VA
https://www.skdtac.com/searchresults.asp?Search=shotgun

https://www.skdtac.com/Esstac-Shotgun-Card-4-Round-p/ess.134.htm

Esstac Shotgun Card - 4 Round

4 rounds of 12 gauge ammunition can be carried on the Esstac Shotgun Card, which is backed with hook velcro. Line the side of your receiver with loop velcro, and you have an ammo "side-saddle" system that you can replace in an instant- perfect for Law Enforcement use, whether it is for breaching or less-lethal rounds. The versatility of these Shotgun Cards will prove themselves many times over the more you use them! Loop Velcro not included. 

Dimensions: 2" x 4 3/8"

Esstac 7-Round Shotgun Card 

by Sean

Esstac Shotgun card - Simple and fast. My jedi master showed me the true benefit of this simple shotgun reload. Slap some velcro on your shotgun's left side. Load a few shotgun cards, and place one on the gun. You can fit the spares (back to back if it's a bigger pouch) in a single mag pouch. As you reload the shotgun, tear off the empty shotgun card, pull out a new one and slap it on. You're ready to slay even more zombies. Super easy, cheap when compared to other side saddles, and very, very fast. View More SKD Staff Picks

7 rounds of 12 gauge ammunition can be carried on the Esstac Shotgun Card, which is backed with hook velcro. Put two of these back to back, and you have a 14-round bundle that fills up a double M4 magazine pouch. Line the side of your receiver with loop velcro, and you have an ammo "side-saddle" system that you can replace in an instant- perfect for Law Enforcement use, whether it is for breaching or less-lethal rounds. The versatility of these Shotgun Cards will prove themselves many times over the more you use them!

Note from Stu @ Esstac about the elastic loop longevity:

"Shoty cards, treat them like a magazine. They will wear more quickly with use rather then just sitting loaded, they will lose some tension over time but that is normal for elastic, I have a couple ammo cans full of loaded shotgun cards and they are still GTG several years later."

Multicam Shotgun cards will be an additional $2 due to limited availability. The Multicam elastic used in this item is being discontinued, and this item will no longer be offered when the material runs out.

Our Price: $15.00

Product Code: ESS.106

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HARD Plastic Loop Velcro Shot Card: Fast Reloads, Lots of Ammo

https://www.combathunting.com/American_Tactical_MB3_Shotgun-MB3_12_Ga_Shotgun_Side_Saddle_Shotshell_Holder.html

SKU: MB3R-SSH 
MPN: MB3R-SSH 
UPC: 4712274526838

MB3 12 Ga Shotgun Side Saddle Shotshell Holder

This quick-detach, side saddle, universal 12 gauge tactical shotgun shell holder carrier holds 6 rounds and fits American Tactical Imports ATI S-Beam MB3R shotguns and most others. This side saddle 6-shot shotshell holder can be mounted on any stevens 12 ga. Shotgun receiver or flat stock with available mounting space. Put it in any convenient location for fast reloading. Made from strong durable metal alloy with split-body dove tail design for 6 shell 4 shell and 2 shell mounting options. Fast and easy mounting and removal with hook and loop tape. Mounting hook and loop tap included. Also works great as a separate shotshell storage caddy for your duck blind, duck hunting boat, hunting cabin or patrol car. No gunsmithing required.

12 Gauge Shotgun Shell Holder
Designed For 12 Gauge Shotgun Shells
Strong Durable Metal Alloy Split Body Dove Tail Design
2-4-6 Shell Mounting Option
Easy Mounting And Removal
Approx 6" Long 6 Shell Mounting
Approx 4" Long 4 Shell Mounting
Approx 2" Long 2 Shell Mounting
Holds 6 Rounds Total

No Gunsmithing Required Fits: Any 12 Gauge Shotguns, American Tactical Imports MB3 shotguns, Stevens 320 & S1200, Mossberg 500, Remington 870, And Winchester 1200/ 1300 & Maverick 88 And More With Flat Available Mounting Space.

Regular Price: $24.99
Sale Price: $16.99
You Save: $8.00

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MOLLE/PALS 12 Gauge Loose in Ammo Pouch (Retrieve 1-at-a-time to Load)

https://www.voodootactical.net/molle-gear/pouches/high-speed-gear-molle-tactical-shot-shell-ammo-pouch-holds-12-shells.html

Having 14x 12-gauge shells in shot cards or 22x loose in a MOLLE/PALS AR15/M16/M4 double mag pouch attached to your LBE is reasonable giving you 4 + 1 in the shotgun with 7 x slugs on the sides for 12 x rounds in/on your AR/ASG for a total of 26 or 34--is a powerful combat load at the trade-off of 6 total pounds or 6 x 30 round 5.56mm magazines aka 180 rifle shots. In a future TactiSMART article we will go into more 20mm/12 gauge carry options. 

Why Go to the Trouble of an AR/ASG?

The qualitative firepower advantages of large 12-gauge shells doing things small 5.56mm bullets cannot achieve is the key decision point to decide in favor of an AR/ASG. The 2nd main reason is having instantaneously a 2nd weapon firing capability when reloading your PRELM-dependent (PRELM-D) AR which unfortunately can't Stripper Clip Load (SCL). If you run out of PRELMs, you're screwed. You can initiate firefights with Maximum Rounds Start (MRS) with a long or double magazine of 40-60 rounds because a 60 to 100-round drum's fatness width prevents it from being used as a pistol grip for the ASG.   

https://1sttac.blogspot.com/2020/05/tactismart-008-brother-can-you-spare.html

CAVEAT if you have a 7.62mm x 51mm NATO-shooting M14/M1A, Canadian FN FAL, or 5.56mm-shooting Mini-14 with Cogburn Arsenal Adapter or a short 7.62mm x 39mm-shooting Vz.58 or SKS as your main "AR" weapon, you can both PRELM and SCL---though I haven't worked out the specific details for supplying their undersides with enough Pic rail to attach an ASG with Pic top-rail to them in such a way that the former's magazine can act as a pistol grip for firing.   

12-Gauge ASG Under AR15/M16: Capabilities Rifle Shots Cannot Perform

* Firepower when 5.56mm AR15/M16 is out of ammo (no exposure time)

* Door Bolt/Hinge removal

https://www.iammo.com/ammunition/shotgun-ammo/fiocchi-ammunition-aero-rifle-12-gauge-2-75-slug-lead-10-rounds-12leslug.html

* Flare Signaling

Exotic Products Blazer Signal Flare .12 Gauge (2.75") Shot (3 Rounds) - 00505

https://www.iammo.com/exotic-products-blazer-signal-flare-12-gauge-2-75-shot-3-rounds-00502.html
http://www.americanspecialtyammo.com/12_Gauge.html

* 00 Buckshot or Birdshot Spread  

https://www.iammo.com/ammunition/shotgun-ammo/hornady-critical-defense-12-gauge-2-75-00-buck-shot-lead-10-rounds-86240.html

Sometimes you absolutely need to make hits--be it threatening humans or a game bird so you have something to eat. 

Flechette, Blanks

http://www.americanspecialtyammo.com/12_Gauge.html

OC Pepper Spray, Bean Bag, Rubber Pellets

http://www.americanspecialtyammo.com/12-ga--less-lethal.html

If you want to not kill threatening humans but instead hit them and make them leave you alone, the 12-gauge can shoot tear gas, OC pepper spray, a Bounty Hunter's bean bag or rubber pellets.  

Mini-Tear Gas

https://www.ammunitiontogo.com/product_info.php/pName/9rds-12-gauge-oc-tear-gas-ammo

9rds - 12 Gauge OC Tear Gas Ammo Details

This is 12 Gauge OC Tear Gas Ammo. This ammo is manufactured by A.L.S. Technologies, the leader in Less Than Lethal Ammo. This is a direct fire muzzle blast, 12 gauge round, which fires approximately 80 grains of OC tear gas. This round was designed for single or multiple target engagement allowing escalation of force from a safe distance prior to use of lethal means. The OC tear gas muzzle blast dispersion round is designed to cause disorientation through a tearing and burning sensation in the eyes, involuntary closing of the eyes (blepharospasm), violent coughing, shortness of breath (dyspnea) and is an irritant to exposed skin surfaces. This ammo is completely legal for you to own at this time.

Armor-Piercing Incendiary Slugs

https://www.firequest.com/G12-008.html

12 Gauge Armor Piercing Incendiary - 3 Rounds Per Pack
$14.99

12 Gauge Armor Piercing Incendiary - 25 Rounds Per Pack
$99.99

Order# G12-008

This light recoil, metal piercing slug penetrated TWO car doors and still has plenty of horse power to take care of business on the other side. It also has an incendiary tip that will explode with a bright flash and sparks upon imact. It is visible day or night upon impact. It will burn at 3000 degrees when it hits a sufficiently hard target.

2 3/4" shell

*Use extreme caution when shooting this ammo, it will start fires when it explodes around flammable objects.

This item is restricted in the following cities and/or states: AK, CA, FL, HI, MA, NY, APO's, FPO's, PO Box's, Washington DC; . Illinois Cities: Chicago. FOID Required for all IL Cities. ; CT, NJ: Pistol Permit# Required.  Please check your local State, County and City laws for restrictions on ammunition.

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* Exotic 12 gauge firepower variants

Shooting .50 cal BMG out of a shotgun?

https://www.youtube.com/watch?v=xjkHK3JWHdM

Napalm

https://www.youtube.com/watch?v=N-NukcV3Vsk

Anti-UAV Drones

Less than 100 meters Reach; Anti-Drone Net Shotshells. Our AR/ASG's green laser/flashlight and red dot collimator reflex/night sight would enable precise aiming directly onto the creepy drone giving the SKYNET the maximum chance of grabbing it. Plus, bird shot can also be used to knock-down drones destructively.

VIDEO REVIEW

https://www.youtube.com/watch?v=hRgAn9GJEbQ

RETAIL SOURCE

https://www.budk.com/12-Gauge-Skynet-Drone-Defense--3-Pack-35975

12 Gauge Skynet Drone Defense - 3-Pack

Your Price:
$23.99

In Stock - Ships Today!

FREE SHIPPING

on orders over $49

This is your best drone defense system

12 gauge rounds are 2 3/4” chamber

Shells separate into tethered pieces

Web expands to 5' in diameter

Cords wrap around drones bringing them down

Missed shots parachute safely back to ground

Convenient, economical 3-pack

Product Description

Are you bothered by those pesky drones? The Skynet Drone Defense system is designed to down a drone that could be interfering with police investigations, or simply trespassing and spying on public or private property. Using 12 gauge rounds as the delivery system, the shells separate into tethered pieces after firing them. As these parts separate and extend outward, a web is created that is 5' in diameter. When the SKYNET round reaches the drone, the tethers and round pieces wrap around the drone, interfering with the propellers and forcing the drone to the ground. If the SKYNET round misses the target, it is designed to parachute safely to the ground to reduce any unwanted damage or injury. There are three in the pack.

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Baby 12-Gauge Shotgun Mini-Shells

Not to confuse the situation further--but there are new small 12-gauge shotgun shells available about half as long as the common 2 3/4" sized shells. This increases the number of rounds you can have in the shotgun and body carry at the trade-off of reduced firepower. The Keltec KSG SBS capacity increases from 10 to 16 mini-rounds. Be advised you will need to modify your ASG's follower in its tube to fire these baby 12 gauge shells which then precludes them from firing full-size 20mm shells. 

Differing Ammo Adapters

Not to make your head spin, there are 12-gauge shotgun shells that serve as sub-caliber adapters for a myriad of cartridges like 9mm x 19mm Luger pistol and .22 Long Rifle (LR) cartridges [gunadapters.com] with tiny 3" and larger mini-barrels. 
Short Lane 12-gauge .22LR adapters come in 3", 5" and 8" mini-barrel lengths for increased range/accuracy.

12ga to 22LR rifled shotgun adapters Gunadapters

https://www.youtube.com/watch?v=ork6tsmSjRM

Gunadapters.com writes:

"No, our adapters are designed for break action double or single barrels Shotguns ONLY.  Our adapters will not cycle through pump or semi-automatic shotguns & because of their weight they can damage or break the extractor(s)."

However, Short Lane aka gunadapters.com are wrong--and being typical corporate don't-sue-us pussies--don't even inform you (much less properly make them this way) that you can cut-out slots in their steel adapter's rim where the extractor interfaces in a pump-action shotgun for grabbing to instead keep the adapter in for more sub-caliber, shots. Details:

https://www.youtube.com/watch?v=sZaIsbLDQDc

Gaugemate.com's sub-caliber adapters don't need any modifications and cycle flawlessly through pump-action shotguns--but are out-of-business? and hard to find to buy. 

https://www.youtube.com/watch?v=siTsrJxWXLM
(800) 709-9910

DINA Arms offers lightweight aluminum 12-gauge adapters but are temporarily unavailable from New York-based, NUMRICH Gun Parts Corporation aka gunpartscorp.com due to the COVID 19 panic-demic. 

https://www.gunpartscorp.com/products/881160

SHOTGUN CONVERSION ADAPTOR BY DINA ARMS CORP.

Allows shotguns to fire either rimfire or centerfire ammunition. Machined from high-tolerance 2011 aluminum with 6-groove rifling. No gunsmithing required. Simply insert the loaded adaptor into the shotgun barrel chamber.

THERE ARE 8 VARIATIONS OF THIS PRODUCT AVAILABLE: 

12 gauge/.22LR
12 gauge/9mm  
12 gauge/.357 Magnum
12 gauge/44 Magnum

20 gaufe/.22LR
20 gauge/9mm
20 gauge/.357 Magnum
20 gauge/.44 Magnum

CURRENTLY VIEWING:

12 Gauge/.22 LR
Enlarge Image
12 Gauge/.22 LR
Product #: 881160

We only ship to U.S.A., U.S. Protectorates, and Canada.
$28.25

Numrich Gun Parts Corporation
226 Williams Ln. 
Kingston, NY 12401
(866) 686-7424
FAX: (877) 486-7278

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Chiappa Firearms offers .357 Magnum, .38 Special, .380, .40, .44 Magnum, .45 ACP, .45 Long Colt, 5.56mm x 45mm, 7.62mm x 39mm SOVIET, 7.62mm x 51mm NATO 20 and .410 gauge shotgun, 9mm adapters @ $100 each to make your 20mm/12-gauge ASG shoot nearly ANY ammunition you can VULTURE obtain. All 10 plus of the adapters fit into a belt pouch--but this is a $1, 000 investment for 80% ammunition scrounge versatility.    

X-Caliber Survival Shotgun Adapters

https://www.youtube.com/watch?v=1jnM7IEYujw

As stated in a previous TactiSMART article on .22LR [ https://jamesbondisreal.blogspot.com/2020/05/tactismart-010-need-22lr-for-edcshtf.html ], this round offers frugal small game food hunting capabilities that your AR/ASG or stand-alone SG can have by the tiny weight of an adapter bolt in the AR or an adapter shell in your ASG vs. 5 pounds of a AR-7, Ruger 10/22 rifle etc. Sub-caliber .22LR adapters make the AR/ASG a quiet sentry removal tool good out to 50 meters using subsonic ammo:

CCI Quiet .22 Ammunition Noise Level Demo Comparison to Regular .22LR & .22SR

https://www.youtube.com/watch?v=0-HFmYKzhx8

Supersonic vs. Subsonic .22LR UNSUPPRESSED Sound Comparison

UNsuppressed vs. Suppressed

https://www.youtube.com/watch?v=2uEy8eV1tAQ

How Quiet are CCI .22LR Quiets--without a suppressor?

https://www.youtube.com/watch?v=YS5SPWHw8yY

Air Pellet Gun: 80 decibels
.22LR CCI Quiet: 81 decibels
Lawn Mower: 130 decibels

...or can shoot small game like rabbits for SHTF food instead of overkill using a full-sized 5.56mm or 12-gauge shell. 

https://www.sportsmansguide.com/product/index/cci-quiet-22-22lr-lrn-40-grain-50-rounds?a=1669662

CCI Quiet-22, .22LR, LRN, 40 Grain, 50 Rounds $3.99
Item # WX2-310924
Mfg. Number: 960
UPC: 076683009609

Excellent accuracy and velocity in a true ultra-quiet plinking Round! Quiet-22TM is about as loud as standard air rifle ammo, but offers much better downrange performance. It's perfect for legal shooting areas where noise may be a concern, and makes a great "soft" introduction for the young shooter. And this round is great for shooters using bolt-actions or single-shot rifles (but is perfectly safe in semi-automatics, though it might not entirely cycle the action). So save your ears... 68dB @ your ear - up to 75% quieter in perceived noise vs. standard .22 LR rounds…get Quiet-22 Ammo and ditch the muffs.

Key Specifications

Item Number: 310924
Mfg. Number: 960
UPC: 076683009609
Caliber: .22LR
Bullet Weight: 40 grain
Bullet Style: LRN
Muzzle Velocity: 710 FPS
Muzzle Energy: 45 ft.-lbs.
Case Type: Brass
Corrosive: No
Rounds: 50

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War Practice, Practice, Practice!

DIY: How to Make Dummy/Inert Training 12-Gauge Shotgun Shells

https://www.youtube.com/watch?v=S-ymjDJhY7M

BUY 'EM

Here's a source for dummy 12 gauge shells in clear plastic marked "DUMMY":

https://www.midwayusa.com/product/1018805265

Fiocchi Action Proving Dummy 12 Gauge 2-3/4" Box of 10

Product #: 475371 Manufacturer #: 12INERT UPC #: 762344703404

Our Price: $6.99 ($0.70/Each)
Available
Ships today from MidwayUSA
 Quantity: 10

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https://www.officerstore.com/store/product.aspx/productId/19014/selectedVariationId/45176/S-T-Action-Pro-Action-Trainer-Dummy-Rounds

S.T. Action Pro Action Trainer Dummy Rounds: 9mm
 4.5
(6) Q & A W-ST-9
LIST: $1.20
SAVE: $0.06
$1.14 Out of Stock
Sku: ST-12 GAUGE is out of stock

In stock in approximately 2 weeks.EMAIL ME when item is in stock.

PRODUCT OPTIONS: 12 Gauge

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My 2 cents is use if DIYing them, make BLUE-colored plastic 12 gauge shells as your 7 x dummy/inert WarPrac shells since BLUE is the color for training aids and dummy ammo in the USMIL. However, BUYing them like the very affordable, $7-for-10, MIDWAYUSA CLEAR dummy 12-gauge shells with "DUMMY" stenciled on the side with visible bird shot are excellent practice aids, too! 

AR/ASG using MB3R Shell Card Loads TTPE3 SOP

MB3R can accommodate a 4-shell card on the receiver left and a 3-shell/shot card on the right to leave some space away from the ejection port. 

You could easily carry over 100 x tiny .22LR rounds in a small MOLLE/PALS pouch and have its 12-gauge adapter held in a shotcard elastic loop like a regular shotgun shell; velcro-mounted on the side of your ASG under your AR. I suggest having it in a 4-round shotcard with 3 x ANTI-DRONE shells on the MB3R. Being all silver metal, the 12-gauge .22LR adapter should be easy to identify. If you think sentry removal function is very likely perhaps have it in a 3-round shotcard with say 2 x SLUGS on the right-side of the MB3R.  

Primary differentiation is the SIZE of the shotcard; 3-round baby shell cards hold specialty SLUGS or ANTI-DRONE or SIGNAL FLARE or DIFFERING AMMO ADAPTER shells attached to the RIGHT of the receiver. Slightly longer 4-round shot/shell cards always hold 00 BUCKSHOT on the LEFT of the receiver.

LEFT = COMBAT
RIGHT = SPECIALTY

FIREPOWER 400+

ASG

In/On Gun

4 + 1 rounds (5) of 00 BUCKSHOT in MB3R
Black: on left side of receiver: 4 x 00 BUCKSHOT 
Black: on right side of receiver: 3 x SLUGS for door hinge breaching or 3 x Tear GAS shells *

On Body

Black: in a AR15/M16/M4 Pouch on LBE: 4 x 00 BUCKSHOT
Black: in same AR15/M16/M4 pouch on LBE as above: 3 x SLUGS or tear/OC pepper GAS
Green ranger: in same AR15/M16/M4 Pouch on LBE as above: 3 x ANTI-DRONE shells/1 x .22LR SUB-CALIBER Adapter
Multi-Cam: 3 x SIGNAL flare shells

TOTALS

   4 plus 1 in MG3R shotgun (5)
   3 on right receiver
   4 on left receiver
________________
  12

   2 x 4 rd shotcards (1 is .22LR adapter), 2 x 3-round cards (13) or 22x loose in a MOLLE/PALS AR15/M16/M4 LBE pouch 
100 x Sub-Sonic Quiet .22LR rounds
_________________________________________

25 or 34 x 20mm/12-gauge Shells; 100 x .22LR Stealth Shots (upside-down .22LR in adapter not secure holding a .22LR round so not counted)

* Should have a Field Protective Mask aka Gas Mask on before firing! An Anti-COVID 19 N95 facemask on at the very least.   

AR15/M16/M4

In/On Gun

  40-60 + 1 rounds in gun using reliable long box magazine w/pull/carry loop for MRS; also serves as the ASG pistol grip 

  30-round mag in buttstock holder

On Body

240 rounds in 8 x 30-round mags or 4 x 60-round mags in MOLLE/PALS pouches on LBE
__________________________________________

310 to 330 x 5.56mm rounds plus 1 in chamber

GRAND TOTALS

  25 to 34 x 20mm/12 gauge Shells (1 in chamber)
100 x .22LR Stealth Shots (none in adapter)
310 to 330 x 5.56mm rounds plus 1 in chamber
_______________________________________

436 to 465 x total shots

The above 400+ish firepower array offers startling capabilities from a near-silent .22LR "pop" taking out a sentry or bringing a rabbit home for dinner to a 20mm/12-gauge "boom" blasting through a door bolt or swatting down an air drone or putting a buckshot spread or non-lethal bean bag or pepper spray into thuggies to the rapid-fire, "crack" of 5.56mm high-velocity bullets zipping thru enemy's body armor, cars/trucks out to at least 300 meters. You can also pyrotechnically visual signal to others, start fires, or bring down flying birds or running deer for breakfast, lunch & dinner.   

Summary/Conclusion

U.S. ARMY's M26 CMORE AR/ASG Combo

The tube-fed, 12-gauge shotgun is lighter than magazine-fed shotguns in over 26" overall lengths to avoid AOW "ATF kick me" complications. Some smaller Master Key shotguns have such short barrels they are only good for point-blank, door bolt breaching and are little help in a PDZ/CQB fight where at least 50m range reach is the minimum requirement. Pump-action is desirable to negate strong felt recoil of firing 12-gauge rounds. An affordable under $150, over 26" long, pump-action, ASG with Pic top rail can attach under an AR with bottom Pic rail making an AR/ASG combo weight manageable if you have a good sling and strong upper body. Shot/shell card 12-gauge shell carry can differentiate different ammo types and attach to the sides of the AR/ASG and be carried in pouch(es) on your LBE. Empty shot/shell cards can be retained by soft Velcro sewn to the sides of your clothing's legs for re-use.    

The James Bond Citizen (JBC) is under daily geostrategic assault by the sex-with-poop, DemoncratHedonists trying to force their degraded & immoral life world-view down-our-throats by societal norms, illegal secretly-instigated, dirty-trick laws and at some point--1776-style tyranny if WE THE PEOPLE are Illegally disarmed and unable to defend ourselves with military-effective, guns. Some geotactical threats are moving and need a 12-gauge shot pattern to hit them--like air drones spying on you or diving on you to murder you. Wildgame like birds need bird shot spray patterns to bring them down for emergency food needs. The QUALITY of firepower large-width barrel, 20mm/12 gauge offers that small barrel width, pistols/rifles are hard-pressed to offer makes the former's weight worth it. We have offered a bare minimalist, AR/ASG approach here using the rifle/carbine's stock for shoulder aiming & firing of the ASG so 3 gun types (5.56mm, 20mm/12-gauge and .22LR) are always in your hands--and not one of them precariously slung at your back and not instantly available. 

Airborne!

James Bond is REAL.  

NOTES

Other Adapters

https://www.shootpointblank.com/product/aim-sports-shotgun-tri-rail-barrel-mount-universal-12-gauge-1.5-aluminum

Aim Sports Shotgun Tri-Rail Barrel Mount Universal 12 Gauge 1.5" Aluminum

SKU: MT025
Model: Shotgun
UPC: 815879012258
$16.35

Shotgun tri-rail barrel mount is made from black anodized aircraft grade aluminum and accepts all standard weaver / picatinny 1913 accessories. It requires no gunsmithing and is compatable with the barrels of most 12 gauge shotguns.

Pricing Unit EA
UPC 815879012258
MAP 16.35
Width 3.80
Length 5.50
Height 1.80
Weight 0.32
Model Shotgun
Finish Black
Series Tri-Rail Barrel Mount
Similar Items BSSG
Size 1.5"
Type Barrel Band

Master Key ASG Candidates

KelTec KSG Regular-length Barrel, Compact and Tactical SBS

CAVEAT: Needs Picatinny Rail on top to extend all across its top for AR/ASG Interface

https://www.keltecweapons.com/firearms/shotguns/ksg/

The one that started it all. The KSG was our first entry into the 12ga shotgun market, so naturally we had to completely redefine it by setting a new standard in both magazine capacity and overall length. Here’s the short and not-so-long of it: Legal in all 50 states, the KSG holds 6+6+1 (or 7+7+1 depending on shell length) in a 26.1” package. That’s not a typo- it holds a lot of ammo at just over two feet long. It comes standard with an 18.5″ barrel and Picatinny-style rails for mounting your favorite accessories on both the top and bottom.

KSG Compact™

Sure, fill out the short-barrel shotgun paperwork… and then take this lil’ guy home while you wait for that tax stamp to come in. Or, just leave the 18.5″ barrel alone and enjoy all the benefits of an SBS without the fuss. It still holds 4+4+1 or 5+5+1 of 12ga depending on your choice of shell size. It’s compact, features a built-in foregrip that houses a 450 lumen KeltTec light with momentary switch and Picatinny style rail up top for mounting your favorite optic.

KSG Tactical™

For class 3 dealers and those willing to buy a tax stamp, the KSG Tactical is the coolest 12ga short-barrel shotgun on the market. Technically it’s an SBS, however it features a 13.7″ barrel and dual magazine tubes packed into a 21.5″ overall length.It holds 4+4+1 or 5+5+1 depending on shell size. The foregrip is molded into the forend and houses a 420 lumen KelTec light with momentary switch. Like the other KSG variants, the muzzle is threaded for a choke adapter or breacher comp and comes standard with a Picatinny style top rail for mounting an optic.

https://www.keltecweapons.com/product/ksg-carlson-comp/

Breacher attachment for KSG

Recommend:  KSG-937 Barrel Ring Lug Tool to install the Carlson comp.
$51.00

https://www.keltecweapons.com/product/ksg-v6-muzzle-brake/

The V6 Muzzle Brake made by V6 Industries reduces felt recoil and muzzle rise. Made from solid billet, this compensator is of very high quality.

Recommend:  KSG-937 Barrel Ring Lug Tool to install the V6 Muzzle Brake.
$130

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Expensive $1, 000-$1300
Needs Pic rail to extend all across top for AR/ASG interface
11 to 15-rounds as fast as you can squeeze trigger
Revolver magazine reloads
Pump-Action NO RECOIL if slide retracted instantly upon firing 
Tactical SBS variant has AOW "ATF arrest me" tax stamp complications 

Crey Precision 612

https://six12.com/

Mythical: does it exist?
Expensive $2, 000
6-rounds as fast as you can squeeze trigger
Revolver magazine reloads
AOW "ATF arrest me" tax stamp complications  

CMORE M26

Expensive $3, 000
Bolt-Action hard recoil
FAST 5, 10, 20 round magazine reloads
AOW "ATF kick me" complications

https://en.wikipedia.org/wiki/M26_Modular_Accessory_Shotgun_System

The M26 Modular Accessory Shotgun System (MASS) is a developmental under-barrel shotgun attachment for the M16/M4 family of United States military firearms. It can also be fitted with a pistol grip and collapsible stock to act as a stand-alone weapon. It is replacing the current M500 shotguns in service.[1]

Chinese MB3R 

4-Round pump-action, 12 gauge Shotgun with Top Picatinny Rail for Attachment Under an AR15/M16/M4 AR

Affordable: under $135 
Comes with Picatinny top rail and bottom rail
Pump-Action NO RECOIL if slide retracted instantly upon firing 
SLOW tube reloading 
6 pounds
Over 26" long without stock; barrel is 18.5" long; No AOW complications

https://www.gunbroker.com/item/857383571
https://www.armslist.com/posts/10867611/huntsville-alabama-shotguns-for-sale--american-tactical-mb3-r-12-ga-shotgun--nib
https://www.budsgunshop.com/product_info.php/products_id/30247

$135 Lay-Away Option

https://www.americantactical.us/5724/detail.html
https://gun.deals/product/ati-atigmb3r-s-beam-atigmb3r-pump-shotgun-185-bbl-17999

New for 2017! American Tactical is proud to present the newest addition to our line-up, the MB3 series of shotguns!These classic 12ga pump shotguns are simply perfect for home defense at an amazingly affordable price.The MB3-R features a mounted picatinny rail for optics and a blade style front sight.12 Gauge, 3" 18.5" Barrel 39.25" Overall Length 4+1 capacity Compatible with Magpul Parts MAG496 and MAG460 and other similar designed parts from accessory manufacturers (may not work with all manufacturers).

SKU#: ATIGMB3R-SMGA
UPC#: 0813393019784

https://gun.deals/deal/441631

$119.99 + FREE S/H 

https://www.tombstonetactical.com/catalog/american-tactical/atigmb3r-s-beam-shotgun-12ga-18-5in-4rd-black/
https://www.armslist.com/posts/11054715/dothan-alabama-shotguns-for-sale--we-are-giving-away-a-tac-14-12ga--

(334) 794-9100

Emperor Arms Duke 

4-Round, Pump-Action 12 Gauge Shotgun

Inexpensive: $190
Pump-Action NO RECOIL if slide retracted instantly upon firing
NOT an AOW or SBR
5 pounds  

Emperor Arms is a family-owned Turkish firearms manufacturer, whose primary product line is shotguns.  The company itself has been in business over 80 years, and has had a presence in the U.S. for the last decade. 

This is their Model MXP12, a 12-gauge pump-action shotgun which features an 18.5-inch chrome-lined barrel chambered for 2.75 and 3-inch shells, a synthetic stock, crossbolt safety, and a capacity of 4+1.  The MXP12 is constructed of 4140 steel components, and comes standard with a generous recoil pad, an oversized slide release, and dual action bars.

I don't know if the most-affordable, $190 full stock variant has top Picatinny Rails 

https://www.budsgunshop.com/product_info.php/products_id/411559049

...like its more expensive $300 pistol grip cousin?

https://www.budsgunshop.com/product_info.php/products_id/411558986

BLACK ACES Tactical

Expensive: $1500
Pump-Action NO RECOIL if slide retracted instantly upon firing
NOT an AOW or SBR
5 pounds  

https://www.youtube.com/watch?v=WP5KbWOe64g
https://www.blackacestactical.com/

BLACK ACES may not realize their 12-gauge-shooting "firearm" would make a compact & handy weapon under the barrel of an AR15/M16/M4...

MOSSBERGS

Affordable $500
Pump-Action NO RECOIL if slide retracted instantly upon firing 
SLOW tube reloading or 5, 10, 20-round magazines
6 pounds
Over 26" long; No AOW complications

https://www.mossberg.com/category/series/500-jic/
https://www.mossberg.com/category/series/500-cruiser/

500 Tactical – JIC FLEX

#57340 12 5+1 18.5" Cylinder Bore Bead Matte Blued FLEX Pistol Grip (Black) 28.125" 5.5 lbs

https://www.mossberg.com/mossberg-expands-590-shockwave-12-gauge-offerings/
https://www.mossberg.com/category/series/590-shockwave/
https://www.mossberg.com/product/shockwave-spx/

Overall 1.8" longer but BBL is 4.5" longer and 0.25 lighter than SHOCKWAVE

590 SPX

Gauge 12
Capacity 5+1
Chamber 3"
Barrel Type Heavy-Walled w/ Heat Shield, Stand-Off
Barrel Length 14.375"
Sight/Base Bead
Choke Cylinder Bore
Barrel Finish Matte Blued
Stock Finish Raptor Grip/Corncob Forend w/ Strap
Weight 5.75
Length 26.37"

SHOCKWAVE MAGFEED

5 to 15 more ready rounds than above models; Overall 1.2" longer, BBL 0.8" longer and 1 lb heavier than 590 SPX

Gauge 12
Capacity 10+1
Chamber 2.75"
Barrel Type Heavy-Walled
Barrel Length 15"
Sight/Base Bead
Choke Cylinder Bore
Barrel Finish Matte Blued
Stock Finish Raptor Grip / Corn Cob Forend w/ Strap
Weight 6.55
Length 27.5"

SKO Semi-Auto Shotgun

Expensive $560
5 round mag-feed
Semi-Auto fire as fast as you can squeeze trigger
Heavy 7.14 pounds
No Pictatinny rails to connect to underside of AR15/M16/M4

https://www.cheaperthandirt.com/standard-manufacturing-sko-shorty-semi-auto-shotgun-12-gauge-18-barrel-with-internal-choke-threads-3-chamber-5-round-detachable-box-magazine-pistol-grip-with-ar-style-controls-matte-black-finish/

The SKO Shorty from Standard Manufacturing is an excellent choice as a personal defense shotgun that would happily pull double duty as a close quarter's hunting gun. It features an 18" barrel that's threaded to accept Trulock pattern choke tubes and aircraft grade aluminum receivers. This unique looking shotgun is a gas operated semi-auto design that provides you with the familiarity and simplicity of the popular AR-15 platform. Pair that with a vertical forward grip, and detachable box magazine and you have a winning combination. The SKO Shorty will accept either a 2-3/4" or 3" length shotshell providing you with excellent load diversity. So whether you are out in the field hunting hog or handling the varmints, predators, or pests that may lurk in or around your home make sure you select the right tool for the job, pick up an SKO Shorty semi-automatic shotgun 

SKO Shorty Specifications and Features:

MFG#: SKO12SBLK
Gas-Operated Semi-Automatic Shotgun
12 gauge
18" Barrel with Internal Choke Threads
3" Chamber accepts 2-3/4" and 3" Shells
5 Round Detachable Box Magazine
Accepts Trulock Thread Pattern Choke Tubes
7075 Aircraft Grade Aluminum Receivers
Pistol Grip and Forend Grip
AR Style Controls
Overall Length: 28.75"
Weight 7.14 Pounds
Mattel Black Finish
Includes:
1 TruLock Spreader Choke Tube (in the barrel) 

MINIMALIST BREACHING-ONLY

UBS-12

Expensive
2 + 1 shots; 3 less than MOSSBERG tubes; 5 pounds lighter 
ONLY GOOD FOR DOOR BREACHING--not tactical firing
AOW "ATF kick me" complications

Video in action

https://www.youtube.com/watch?v=6wCKm6fWjPo

NO GO: UBS MOUNT WILL NOT CONNECT MOSSBERGS TO AR15/M16/M4s. 

https://www.ammoland.com/2016/09/introducing-the-ubs-12-shotgun-by-lockhart-tactical/#axzz6DGpnmUSr

Read more: https://www.ammoland.com/2016/09/introducing-the-ubs-12-shotgun-by-lockhart-tactical/#ixzz6DGqX1nbB 
Under Creative Commons License: Attribution 
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Introducing the UBS-12 Shotgun by Lockhart Tactical

Ammoland Inc. Posted on September 8, 2016 by DeltaOperatorMan
Lockhart Tactical UBS-12 Shotgun

Vancouver Island, BC -(AmmoLand.com)- The UBS-12 (Under Barrel Shotgun 12 Gauge) is a door breaching shotgun system manufactured by Lockhart Tactical.

Typically Soldiers or Law Enforcement officers are forced to carry a breaching shotgun in addition to their standard issue rifle during operations. Our UBS removes this requirement. Our system consists of a Grizzly shotgun embedded in our proprietary quick-release mount which is to be used in an underbarrel configuration much like the M203 grenade launcher.

Our shotgun cannot be operated independently due to not having a pistol grip behind the trigger. When firing the UBS, the magazine of the parent firearm must be used as a pistol grip. We will soon be releasing a proprietary Pistol grip and Buttstock which will be able to be quickly attached and detached on the UBS for independent firing without being attached to another firearm.

What can the UBS-12 Mount do for me?

Whether or not you're a Soldier, LE Officer or Professional using this device for breaching, our UBS has a lot to offer. Civilian Hunters can benefit immensely by carrying our tiny UBS under their favorite bolt action hunting rifle. Nothing is better than peace of mind and security of having 12GA Slugs or Buckshot at your finger tips when it's needed most.

Apart for security reasons, Hunters could also quickly attach our UBS to help ensure they don't go home from a hunt empty handed. Maybe you won't see a deer cross your path, but if an unlucky flock of turkeys happens to surprise you… Seize the day! Our shotgun features a 2+1 magazine which means its perfectly legal for hunting.

Use our Mount to attach your currently supported shotgun, and connect it to another firearm platform!

Attachment Mechanism:

The Lockhart Tactical UBS-12 features dual locking levers manufactured 100% in the USA by American Defense. These patented quick release, automatic locking levers are the best in the world. Rest assured, these won't ever be coming off unintentionally!

Mount Features:

Our proprietary billet aluminum mounts are machined entirely in BC, Canada and requires a mere 10 picatinny rail slots (4″ / 10cm”) to attach securely. Our mounts will soon feature a proprietary quick attach Buttstock and Pistol grip combination to convert our UBS to a Non Restricted shoulder-fired Micro Shotgun. Shortly we'll also release our Quick-Attach Optic mount which will sit on top of the UBS while in the shoulder fired configuration and shall hold zero on optics when detached and reattached.

Lockhart Tactical UBS-12 Shotgun

Firearm Platforms:

Our mounts will be compatible with the following firearms:

AR15
AR10
SKS
M4
M14
M16
Robinson Arms XCR
Norinco Type 97
Just Right Carbines (9mm, .40, .45)
Ruger 10/22
MP15-22
Mossberg Tactical 715T
SCAR
Heckler & Koch HK416
Sig Sauer 522
Sig Sauer 516
SR-47
AK47
And More! (Strong Bottom Rail Required!)

Mount Specifications:

Weight: 0.2 lbs
Length: 7″
Width: 1.25″
Height: 2.75″

Product can be seen here:

http://www.lockharttactical.com/category/product/8583498-lt-ubs

http://www.lockharttactical.com/category/product/8583499-lt-ubs-mount

Lockhart Tactical UBS-12 Under Barrel - Shotgun Attachment System - 870 & Clones Mount Only

BRAND: UBS-12 Under Barrel Shotgun
SKU: LT-UBS-12-Mount-BLACK
SALE PRICE: $349.00 each
Color