The LBE Unlimited AR10 308 Black Nitride Bolt Carrier Group is a high-quality component designed for reliability and durability. Crafted from billet 8620 steel the carrier is precision machined to ensure optimal performance. The bolt made from Carpenter 158 steel is case-hardened for exceptional strength. This bolt carrier group features a MilSpec phosphate coating for enhanced protection and longevity. It includes a properly staked gas key chrome-lined gas key and firing pin channel as well as forward assist serrations. Proudly made in the USA this component is an excellent choice for those seeking performance and reliability in their firearm.