Brownells BRN AR-15/M16 5.56MM BOLT CARRIER GROUP, MPI, NICKEL BORON AZT-M4-556-ST-007

The Brownells M16 5.56 Complete Bolt Carrier Group is an affordable option that is built and tested to provide flawless operation in any AR-15 or M16.

The Brownells M16 5.56 Complete Bolt Carrier Group features a bolt fabricated from 9310 steel that includes a heat-treated and shot-peened finish. The bolt carrier itself is built using 8620 steel, which features a hardened finish. The whole BCG is completed with a nickel-boron coating.

• Steel quality assured with magnetic particle inspection
• Features extractor with rubber insert and spring
• Gas-key screws are torqued and staked
• Designed for use with all 5.56-NATO-based cartridge cases.

The Brownells M16 5.56 Complete Bolt Carrier Group features a full assembly that includes the bolt, bolt carrier, gas key, firing pin, cam pin and a firing pin retaining pin.