The Sons of Liberty Gun Works OCKS Bolt Carrier Group is a premium, mil-spec component engineered for reliability and durability in AR-15 platform rifles chambered in 5.56mm NATO and .300 BLK. Featuring a Carpenter 158 steel bolt and a phosphate (Parkerized) finish, this BCG is built to withstand the harshest conditions while ensuring consistent feeding, extraction, and ejection. The gas key is properly staked with Grade 8 fasteners for a secure, long-lasting fit. Whether used for duty, competition, or recreational shooting, the SOLGW OCKS BCG delivers the performance and dependability that Sons of Liberty Gun Works is known for. Sons of Liberty Gun Works OCKS 5.56mm & .300 BLK Carpenter 158 OCKS Screws Phosphate Bolt Carrier Group SOLGW-BCG556-OCKS