Ade Advanced Optics R15/M4 Blank Firing Adaptor with Integral Housing for Carbine, Yellow This a gun safety tool; It is NOT a gun part If a live round is mistakenly fired, most of the energy is spent smashing through the BFA reducing both the range and damage inflicted A BFA may also divert the hot gases from a blank discharge out to the sides, reducing the risk of injury to the target of an aimed shot Made from High Strength Steel Alloy with Precision Blank Firing Adaptor for Carbine Length AR-15;Fits Standard A2 Flash Hider and Barrel