The GAU-5A features a quick-connector barrel and handguard assembly that attaches to the upper and lower receiver of the weapon. The new Aircrew Self Defense Weapon is based on the M4 Carbine, and weighs under seven pounds. It's designed to fit inside the seat survival kit of ACES 2 ejection seats. The M4 carbine also breaks down into two main components. Two pins disconnect the M4's upper receiver from the lower receiver and barrel assembly.
The GAU 5A's pistol grip is designed to fold back against the collapsible buttstock to save space when stowed. It also features folding front and rear iron sights, replacing the standard M16-style A-frame front sight.中譯：
The tube part of a gun, down which the bullet or shell slides when it is fired.
A package of basic tools and supplies prepared in advance as an aid to survival in an emergency.
Civil and military aircraft, lifeboats, and spacecraft are equipped with survival kits.