Upgrade your AR-15 with the ODIN Works Black Nitride Bolt Carrier Group engineered for precision and reliability. Featuring a Type 2 bolt face this component is crafted from durable 9310 steel with a black nitride finish that enhances longevity and reduces friction eliminating excessive lubricant use. The 4130 steel gas key is securely attached with Grade 8 hardware and expertly staked into a milled valley ensuring consistent performance and alignment. Perfect for those seeking a mil-spec high-performance upgrade for their rifle.