Knights Armament introduced their "Assault Machine Gun" a couple years ago, and I had a chance to take both versions (5.56mm and 7.62mm) out to the range recently. The gun is the spiritual descendant of the Stoner 63, but is more directly mades on Eugene Stoner's Model 86 light machine gun. It utilizes the content recoil principle, with the bolt never actually contacting the rear of the receiver during the cycling process. This results in recoil being felt by the shooter as a continuous steady force instead of a rapid series of impacts and that makes it tremendously controllable. Not surprisingly, these guns are already being sold to military and security organizations worldwide...