The Auto Assault-12 (AA-12), originally designed and known as the Atchisson Assault Shotgun, is a fully automatic combat 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 AA-12 uses an advanced recoil system that means the user feels only around 10% of the recoil typically felt from firing a 12 gauge cartridge. As a result, it is possible to fire the weapon on fully-automatic without a significant reduction in accuracy, at least at the closer ranges where shotguns are typically employed. Its design includes significant tolerances, intended to allow the weapon to operate reliably without cleaning for an extended period of time.
In Predators, Royce carries an AA-12 fitted with a drum magazine loaded with Frag-12 Explosive Shells, a tan SureFire M910A Vertical Foregrip WeaponLight and a customized camouflage paint scheme as his primary weapon. The custom camouflage job appears to be similar to the United States Army's pixelized UCP pattern.
In the video game Predators, Royce again carries an AA-12 with a drum magazine loaded with Frag-12 rounds and a customized camouflage paint scheme. However, much like the stunt props when they were sold, his AA-12 does not have the M910A, the mount for the M910A or the sling seen in the film.
- The AA-12 gained attention through its use in the films G.I. Joe: The Rise of Cobra, Predators and, famously, The Expendables films (where it is used by Terry Crews and Arnold Schwarzenegger).