M16 5.56 Bolt Carrier Group Nickel Boron Mp - Brn Ar-15/M16 5.56mm Bolt Carrier Group, Mpi, Nickel Boron

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 Mfg: Brownells