Noveske 5.56/300BLK Small Frame Black Phosphate Bolt Carrier Group 5000429

The Noveske 5.56/300BLK Small Frame Black Phosphate Bolt Carrier Group is a premium, mil-spec M16 full-auto-profile internal component group meticulously engineered for small-frame AR-15 platforms. The robust carrier is machined from domestic, aircraft-grade 8620 steel and treated with a manganese phosphate finish that provides superior corrosion resistance and excellent lubrication retention in harsh environments. At its core, the bolt assembly is crafted from high-fatigue Carpenter 158 steel, shot-peened, and magnetic particle tested (MPI) to guarantee high-pressure reliability round after round. Gas efficiency is strictly managed via a hard GI-spec gas key secured with Grade 8 fasteners, which are precision-staked alongside a chrome-lined gas key interior and a chrome-lined carrier bolt bore. Engineered to manage consistent extraction and ejection in both suppressed and unsuppressed weapon setups, this drop-in assembly is fully compatible with 5.56x45mm NATO, .223 Remington, .300 AAC Blackout, and .22 Nosler cartridges.