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Atchisson Assault Shotgun

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AA12 (Auto Assault 12)
Country of origin



Maxwell Atchisson

Weapon type

Automatic Military Shotgun


12 Gauge (2.75 inches)


Forced gas-operated blowback

Overall length

966 millimeters (38.0315 inches)

Barrel length

457 millimeters (17.9921 inches)

Weight empty

4.76 kg (10.494 pounds)


16 lb (7.3 kg)

Magazine/Cylinder capacity

8 round box, 8, 20, or 32 round drum

Cyclic rate

300 rounds per minute[1]

Maximum effective range

75 meters (246.063 feet)

The Auto Assault 12 Automatic Shotgun or AA12 is an automatic shotgun developed in 1972 as the Atchisson Assault Shotgun by American gun designer Maxwell Atchisson.

The rights of the original prototype were sold to Military Police Systems in 1987. In the following years the design was overhauled until first prototypes were made public in 2004.[1][2] The Current model named MPS AA-12 was released in 2005.

Design details Edit

The AA12 is a select-fire, gas-operated shotgun chambered for 12 gauge (the 2.75 inch variation). It can fire a variety of projectiles such as buckshot, flares and HE rounds.

The weapon's select-fire allows to operate in automatic or semi-automatic.

It has two types of Magazines: the first containing eight cartridges (a box magazine) and the second with a capacity of twenty or thirty two cartridges (a drum magazine).

The AA12 has a rate of fire of 300 rounds per minute with a muzzle velocity of 1050 fps.

References Edit

  1. 1.0 1.1 Article "Auto Assault 12 (AA12) Combat Shotgun for Mil/LE Special Operations" in Defense Review. (Retrieved September 16th 2014, 17:56 CET)
  2. Article "Atchisson Assault Shotgun" in Wikipedia The free encyclopedia. (Retrieved September 16th 2014, 18:10 CET)

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