Atchisson Assault Shotgun

Overview

The Atchisson Assault Shotgun is an American prototype shotgun developed by Maxwell Atchisson. It was further developed into the AA-12 by Military Police Systems.

The prototype was constructed from a variety of other firearms including parts from a M1918 BAR and furniture from an M16A1.

The rights of the weapon were sold to Jerry Baber of Military Police Systems in 1987, who developed the firearm further and overhauled it into the AA-12 which was demonstrated to the U.S. Military in 2004.

Maxwell Atchisson Products
Firearms
Rifles	CRACK • Packer
Shotguns	Assault Shotgun
Submachine Guns	.22 Submachine Gun • Model 57

Weapons of the United States of America After 1945

Infantry Weapons
Melee Weapons	Knives	Ka-Bar • M7 • M9 • M11 • OKC-3S
Sidearms	Pistols	GI M1 GI M2 • GI M3 • GI M4 • GI M5 • ICQB • Gyrojet • KP-9 • M9 (A1 • A2 • A3) • M11 • M17 • M18 • M45 (A1) • OA-93 • OA-96 • OA-98 • RM380
Sidearms	Machine Pistols	M10 • M11 • MP9
Close Quarters	Personal Defense Weapons	Colt MARS • IO MP2 • MP7 (A1 • A2) • PDR (C • D)
	Submachine Guns	Colt RO635 • HK MP5-N (MP5K-N • MP5SD-N) • MP9
	Shotguns (automatic)	AA-12 (CQB) • Atchisson Assault Shotgun
	Shotguns (semi-automatic)	KOMRAD • M1014 JSCS
	Shotguns (manual-action)	KS7 • KSG (25 • Compact • Tactical) • M26 • M500 • M590 • M870
Primary Weapons	Assault Rifles	AAI ACR • Bushmaster ACR • CA-415 • Colt 601 • Colt 602 • DT MDR • HK 416 • LVOA-S • LSAT Rifle • M16 (A1 • A2 • A3 • A4) • M17S • M468 • MAS .223 • Masada • Mk 4 • Mk 16 • R5 • REC7 • Remington ACR • Saint • Stoner 63 (A) • XM8 • XM22 (E1) • XM29
	Assault Carbines	Carbon 15 (Type 97) • DT MDR-C • LVOA-C • M4 (M4A1) • XM177 (E1 • E2)
	Battle Rifles	DT MDR • HK 417 • M14 (E1 • E2) • Mk 17 • SA58
	Battle Carbines	DT MDR-C
	Assault Rifles (Exotic)	.50 Beowulf Assault Rifle • AR57 • SR-47
	Assault Carbines (Exotic)	KAC PDW
Automatic Support Weapons	Light Machine Guns	KAC LMG • M15 • M27 IAR • Stoner 86 • Stoner 96 • XM106 • XM207
	General Purpose Machine Guns	[[]]
	Heavy Machine Guns	[[]]
Long Range	Anti-Materiel Rifles	AK-50 • M82 (A1 • A1CQ • A2 • A3) • M107 (A1)
	Bolt-Action Rifles	HTI • M24 (A1 • A2 • A3 • E1) • M40 (A1 • A3 • A5 • A6 • A7) • M2010 • Mk 13 (Mod 5 • Mod 7) • Remington 700 • SRS (A1 • A1 Covert • A2 • A2 Covert)
	Designated Marksman Rifles	M21 SWS • M38 DMR • M39 EMR • M110 SASS (A1) • Mk 14 EBR • SWORD Mk-17 (Mod 0 • Mod 1) • SWORD Mk-18 • XM110 SASS
Launchers	Grenade Launchers (Attachment)	40mm FN40GL • 40mm M203 (A1 • A2) • 40mm M320 • 40mm XM148
	Grenade Launchers (Standalone)	25mm XM25 CDTE • 40mm China Lake • 40mm EX 41 • 40mm M32 • 40mm M79 • 40mm M320 • 40mm T148E1
	Disposable Rocket Launcher	83.5mm M141 • 84mm M136 • 139.7mm FGM-172
	Rocket Launchers	66mm M72 (A1 • A2 • A3 • A4 • A5 • A6 • A7 • A8 • A9 • A10) • 66mm M202 (A1) • 84mm M3 MAAWS
Underwater Weapons	Assault Rifles	[[]]
Explosives	Anti-Personnel Mines	M18 (A1) • MM-1
	Anti-Tank Mines	M15 • M19 • M21
	Offensive Grenades	AN/M14 Thermite • M7A3 CS Gas • M25A2 Riot Control • M47 Riot Control • M67 Frag • M84 Stun
	Smoke Grenades	AN/M8 • AN/M18 • AN/M83 White Smoke Grenade

Firearm Accessories
Weapon Sights	Collimator	Crossfire • Razor • RX30 • Razor AMG UH-1 • SPARC AR • SPARC II • Spitfire 3x • Spitfire AR • Strikefire II • Venom • Viper
	Holographic	EOTech 553
	Iron	[[]]
	Night	[[]]
	Reflector	[[]]
	Telescopic	Crossfire II (1-4x24 • 2-7x32 Rimfire • 2-7x32 Scout Scope • 2-7x32 • 3-12x56 AO • 3-9x40 • 3-9x50 • 4-12x40 AO • 4-12x44 • 4-12x50 AO • 4-16x50 AO • 6-18x44 AO • -24x50 AO) • Copperhead 4-12x44 • Diamondback (1.75-5x32 • 2-7x35 Rimfire • 3-9x40 • 3.5-10x50 • 4-12x40) • Diamondback Tactical (3-9x40 • 4-12x40 • 4-16x44 FFP • 6-24x50 FFP) • Golden Eagle HD 15-60x52 • Ranger 1-4x24 • Razor HD (5-20x50 FFP • AMG 6-24x50) • Razor HD Gen II (4.5-27x56 FFP • 3-18x50 FFP • E 1-6x24) • Razor HD LH 3-15x42 • Strike Eagle (1-8x24 • 1-6x24) • Viper (6.5-20x50 PA • HS 2.5-10x44 • HS 4-16x44 • HS 4-16x50 • HS LR 4-16x50 • HS LR 6-24x50 • HST 4-16x44 • HST 6-24x50 • PST Gen II 1-6x24 (FFP) • PST Gen II 3-15x44 (FFP) • PST Gen II 5-25x50 (FFP)
Attachments	Flashlights & Lasers	[[]]
Attachments	Foregrips & Bipods	[[]]

Infantry Equipment
Camouflage	Camouflage	ERDL • OD • MARPAT • UCP • Woodland
Clothing	Backpacks	[[]]
	Body Armour	[[]]
	Bomb Suit	[[]]
	Elbow and knee pads	[[]]
	Signals & IFF	[[]]
	Suits	[[]]
	Vests & Webbing	[[]]
Headwear	Communication	[[]]
	Gas Masks & Rebreathers	[[]]
	Goggles	[[]]
	Helmets	[[]]
	Vehicle Headwear	[[]]
Optics, Detection and Surveillance	Man-Portable Radar	[[]]
	Mine Detectors	[[]]
	Night Vision Goggles	[[]]
	Periscopes	[[]]
	Rangefinders	[[]]
	Surveillance	[[]]

Artillery
Anti-Aircraft Guns	[[]]
Anti-Tank Guns	[[]]
Field Guns	[[]]
Howitzers	[[]]
Infantry & Mountain Guns	[[]]
Mortars	81mm M252 • 107mm M30 • 120mm M121
Railroad Artillery	[[]]
Recoilless Guns	[[]]
Rocket Artillery	[[]]
Siege Artillery	[[]]

Land Vehicle Weapons
Machine Guns	5.56mm	M231 FPW
	7.62mm	FN MAG • GAU-19 • M37 • M60 • M73 • M219 • M240 • M1919A4
	12.7mm	GAU-19 (A • B) • M2 • T175 (E1) • XM238
Tank Guns	76.2mm	M32 • T91 (E1 • E2 • E3) • T185 (E1)
	90mm	M3 • M41 • M54 • T7 • T15E2 • T54 • T76 • T125 • T208 (E9 • E13) • T209
	105mm	M68 (A1 • E1) • QF20 Pdr • T5E1 • T5E2 • T140 (E3 • E4) • T147 • T254 (E2) • X15E8 • XM35
	120mm	M58 • M256 • T53 • T122 • T123E1 • T123E6 • T179 • Rheinmetall • X23
	152mm	M81 (E1) • XM81 (E6) • XM150 (E5 • E6)
	155mm	T7 (E1) • T180
	165mm	M57 • T156
	175mm	M113 • T256E3
	203.2mm	M1
Howitzers	105mm	M2 (A2) • M4 • M49 • T96E1 • M103 • XM104 • XM103
	155mm	M45 • M126 (A1) • M185 • T186E1 • M284
	203.2mm	M1 • M2 (A1 • A2) • M201A1
	240mm	240mm M1
Autocannons	20mm	M168 • Rh 202
	25mm	M242 • Oerlikon KBA
	30mm	Bushmaster III
	40mm	M2 (A1)
	75mm	75mm XM274
Recoilless Guns	106mm	M40 (A1)
Misc.	Spotting Rifles	M8

Aircraft Weapons & Munitions
12.7mm Aircraft Machine Guns	Browning M2 (AN/M2 • AN/M3) • GAU-19
Aircraft Cannons below & including 30mm	20mm AN/M2 • 20mm AN/M3 • 20mm M24 • 20mm FMC T-160
Aircraft Cannons above 30mm	[[]]

Atchisson Assault Shotgun

Overview

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