CMMG Bolt Carrier Group 5.56x45mm NATO Black Steel M16 55BA419

The M16 Bolt Carrier Group is a complete Mil-Spec assembly designed for 5.56mm/.223 and 300 BLK calibers. Crafted with high-quality materials for enhanced durability and performance, the bolt is made from 9310 steel with a phosphate finish, while the carrier is constructed from 8620 steel with a chrome-lined, phosphate finish for increased longevity. The extractor is made from 4140 steel with a phosphate finish, ensuring reliable function. Built to meet rigorous standards, this bolt carrier group is backed by CMMG's Lifetime Quality Guarantee.