Brownells M16 Complete Bolt Carrier Group 5.56x45mm/.223 Remington/.300 AAC Blackout, Black

The Brownells bolt carrier group (BCG) stands as a testament to precision engineering and quality craftsmanship, produced by a renowned manufacturer in the firearms industry. Unlike many competitors, every component of this BCG is crafted in-house, ensuring superior quality control and consistency. This includes the firing pin and gas key, which are often outsourced by others but are meticulously machined by our trusted manufacturer. Each bolt carrier group undergoes rigorous factory inspections, including checks for hardness, fitment and cam path geometry, as well as magnetic particle inspection of the bolt, ensuring reliability and performance. The materials used are batch-certified and the dimensions adhere strictly to the latest military specifications, guaranteeing compatibility and durability. The Brownells M16 5.56x45mm complete bolt carrier group includes a bolt, bolt carrier, gas key, firing pin, cam pin and firing pin retaining pin, all proudly made in the USA. This BCG is designed for those who demand the highest standards in their firearms components.The bolt is constructed from 9310 hardened steel, has undergone shot peening and has been inspected using magnetic particle testingThe carrier is manufactured from 8620 hardened steelThe extractor is precision machined from 4340 steel and includes a military specification extractor spring and a black O-ringThe gas key is machined from 4130 steel and secured with grade 8 screws, which are correctly staked into a milled valley to ensure accurate positioningThe cam pin is precisely machined from hardened 4340 steelThe firing pin is constructed from 8740 steel, is centerless ground and features a hard chrome coatingBolt inspected using magnetic particle testingThe extractor is equipped with a spring and a rubber insertIncorporates a torqued and staked gas keyCompatible with any cartridge utilizing the 5.56x45mm cartridge case