![]() ![]() "When the bolt flies back after firing to cycle another round, around 80% of what would normally be felt as recoil is absorbed by a proprietary gas system. MPS in turn developed the successor simply known as Auto Assault-12, which was redesigned over a period of 18 years with 188 changes and improvements to the original blueprint, modifications included changing the AA-12 from blowback- to gas-operated with a locked breech. In 1987, Max Atchisson sold the rights of the AA-12 to Jerry Baber of Military Police Systems, Inc., Piney Flats, Tennessee. It is fed from either an 8-shell box magazine or a 20-shell drum magazine. However, the relatively low cyclic rate of fire of around 300 rounds per minute enables the shooter to fire semi-automatically de facto with brief trigger pulls. The shotgun fires in fully automatic mode only. The original design was the basis of several later weapons, including the USAS-12 combat shotgun. The current 2005 version has been developed over 18 years since the patent was sold to Military Police Systems, Inc. The most prominent feature is reduced recoil. The AA-12 ( Auto Assault-12), originally designed and known as the Atchisson Assault Shotgun, is an automatic combat shotgun developed in 1972 by Maxwell Atchisson (however, the original development by Atchisson seems to have produced only a few guns at prototype-level, with the development that ultimately lead to the gun entering the market being done later by Military Police Systems, Inc. 7.3 kg with loaded 32-round drum (original version)Ĩ rounds in box magazine or 20 rounds in drum magazines Maxwell Atchisson (1930-2003) further developed by Military Police Systems, Inc.ĥ.2 kg less magazine. ![]()
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