GAU-5A Aircrew Self Defense Weapon is a 5.56mm carbine designed to break down and fit inside a seat kit attached to ejection seats. (U.S. Air Force) ...

The rest of the rifle is fairly standard mil-spec, the GAU-5A appears to be built with a standard M4 lower receiver and upper receiver, with the commercial parts added on.

The rest of the rifle is fairly standard mil-spec, the GAU-5A appears to be built with a standard M4 lower receiver and upper receiver, with the commercial parts added on.

The Air Force previously used the GAU-5A designation during the Vietnam War-era in its description of a M1 6 rifle variant, as noted by The Drive. The service also used GAU-5A/A to describe its ...