Out of stock
SKU: CMMG55BA419
UPC: 852005002431
The CMMG Bolt Carrier Group M16 5.56 is a mil-spec complete bolt carrier assembly designed for M16-pattern rifles and compatible AR-platform firearms chambered in 5.56 NATO. This component represents the core operating group that cycles ammunition, manages recoil impulse, and drives the rifle's fundamental reliability cycle. Built to government military specifications, this carrier group serves as a drop-in replacement or upgrade for shooters requiring verified mil-spec performance.
Construction centers on an 8620 steel carrier with phosphate finish—a corrosion-resistant coating proven across decades of military service in variable environments. The bolt itself is manufactured from 9310 steel, a high-strength alloy that endures repeated firing stress and bolt-to-chamber contact. Phosphate finish on both components resists rust and salt-air degradation, critical for rifles exposed to field conditions or coastal storage. The complete assembly weighs 0.88 pounds and measures 9.25 inches in length, fitting standard M16 and AR-15 upper receivers without modification.
This bolt carrier group suits law enforcement duty rifles, military training systems, tactical carbines, and civilian recreational shooters seeking verified mil-spec components. It addresses users replacing worn carriers after extended round counts, building new uppers from components, or standardizing equipment across multiple firearms. The mil-spec designation ensures compatibility with existing parts ecosystems and proven performance metrics established by military procurement standards.
Mil-spec bolt carrier groups serve as the reliability foundation in 5.56 NATO systems. Material selection—8620 and 9310 steels—prioritizes durability under sustained fire and field use over cost optimization, distinguishing government-standard components from economy alternatives. The phosphate finish provides functional corrosion resistance suitable for long-term storage and variable-weather deployment, a proven finish type in military arsenals worldwide.
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