5.56X45 NATO CHROME PLATED BOLT FOR AR-15 Complete assembled 5.56 NATO chrome plated AR-15 bolt ready to be used with the carrier of your choice, featuring dual ejectors for superior reliability and performance. NOTE: Does not include firing pin, cam pin, or firing pin retaining pin - see KAK Industry Carrier Completion Kits to complete your BCG Includes Bolt: 9310 steel, MPI tested, hard chrome plated Extractor: 4140 steel, machined and phosphate coated Extractor pin: S7 tool steel, ground, heat treated Ejectors: S7 tool steel, ground, heat treated Mfg: Kak Industry Llc.