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The Auto Assault-12 (AA-12), originally designed and known as the Atchisson Assault Shotgun, is a shotgun developed in 1972 by Maxwell Atchisson. The current 2005 version has been developed over 18 years since the patent was sold to Military Police Systems, Inc. The original design was the basis of several later weapons, including the USAS-12 combat shotgun. The weapon is fully automatic only but fires at a rate of 300 rounds per minute, making it possible to fire one round at a time with brief trigger pulls. It is fed from either an 8-shell box magazine, or a 20- or 32-shell drum magazine.
In 2004, ten firing models of the AA-12 were produced and demonstrated to the United States Marine Corps.
The HAMMER unmanned defense system by More Industries uses dual-mounted AA-12s on the H2X-40 turret. Neural Robotics has also mounted the weapon on their AutoCopter Unmanned aerial vehicle.
|Weight||5.2 kg less magazine. 7.3 kg with loaded 32-round drum (original version)|
|Barrel length||457 mm|
|Rate of fire||300 rounds per minute|
|Muzzle velocity||350 m/s (1,100 ft/s)|
|Effective range||100 m (12 gauge slug)|
|Maximum range||200 m (FRAG-12 ammunition)
|Feed system||8 rounds in box magazine, 20 or 32 rounds in drum magazines|
|Sights||Iron sight, 2x zoom optical scope|
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