BRN AR-15/M16 5.56mm Bolt Carrier Group, MPI, Nitride

The Brownells M16 5.56 Bolt Carrier Group (BRN AR-15/M16 5.56mm BCG, MPI, Nitride) features: - Finish: Black Nitride - Carrier Type: M16 - Caliber: 5.56x45 NATO - Material: Steel (bolt 9310, carrier 8620, extractor 4340, gas key 4130, cam pin 4340, firing pin 8740) - MPI tested bolt - Made in USA Compatibility: AR-15 and M16 platforms chambered in 5.56x45 NATO, 223 Remington, or 300 AAC Blackout - Included components (as part of a standard BCG): bolt, bolt carrier, gas key, firing pin, cam pin, firing pin retaining pin This BCG is designed to work easily and reliably in AR-15/M16 rifles and is finished in Black Nitride for corrosion resistance.