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.