This complete .450 bolt carrier assembly is chrome-lined inside the carrier for long wear. It includes a staked-on gas key with chrome lining, a complete bolt assembly, cam pin, firing pin, and firing pin retaining pin. All components are of the highest quality. In this .450 bolt carrier assembly, the bolt body is marked with two grooves to help with caliber identification. This complete bolt carrier is guaranteed to fit and function in your Windham Weaponry .450 rifle.