This CMMG Bolt Carrier Group (brand part number 55BA419) is a complete, mil-spec M16 bolt carrier group chambered in 5.56x45mm NATO and finished in black steel. Built to the full M16 carrier profile, it’s a ready-to-run assembly for owners building or servicing an M16-pattern upper who need a mil-spec part rather than a semi-auto-only carrier.

Key Specifications

• Chambered in 5.56x45mm NATO.
• Built to mil-spec M16 carrier dimensions.
• Finished in black steel.
• Measures approximately 9.25 inches overall.
• Ships as a complete, ready-to-install assembly.

Frequently Asked Questions

Is this a complete bolt carrier group? Yes, it ships complete and ready to install.

What caliber is it chambered in? 5.56x45mm NATO.

Buy the CMMG Complete M16 Bolt Carrier Group

Get a complete, mil-spec M16 BCG ready to drop into your build. Order it from our CMMG lineup, part of our AR bolt carrier groups selection, at our Lubbock, Texas gun shop for fast, direct shipping.