Aero Precision Complete Bolt Carrier Group, 5.56 NATO, Black Phosphate Steel - APRH100019

Complete mil-spec bolt carrier group designed for AR-15 rifles chambered in 5.56 NATO/.223 Remington. Features an M16-cut carrier machined from 8620 steel with forward assist serrations, Carpenter 158 tool steel bolt, chrome-lined gas key and bolt channel, and mil-spec phosphate coating. Includes shot peening, HPT testing, MPI marking, and properly staked gas key for reliable operation.