Experience unparalleled reliability with the CMMG 55BA419 M16 Bolt Carrier Group, specifically designed to exceed military specifications for performance and durability. Crafted from high-quality 8620 steel and featuring a phosphate finish, this bolt carrier group ensures longevity and consistent operation under the most demanding conditions. Engineered for your 556 upper, it delivers exceptional accuracy and stability. 8620 Steel Carrier for enhanced strength and durability Phosphate Finish for superior corrosion resistance 9310 Steel Bolt for maximum resilience and performance Upgrade your rifle's performance with the CMMG M16 Bolt Carrier Group, built for precision and reliability.