This 5.56/.223 bolt carrier group is laser engraved with the Aero Precision "A" logo. Features an M16-cut carrier machined from 8620 steel, properly staked gas key, chrome lined gas key and firing pin channel, and forward assist serrations. The bolt is machined from Carpenter 158 tool steel, shot peened, high pressure tested (HPT) and magnetic particle inspected tested (MPI). Mil-Spec phosphate finish. MADE IN THE U.S.A.