Fail Zero 5.56x45mm NATO Full-Auto AR-15 Bolt Carrier Group

The Fail Zero FZM16401NH Bolt Carrier Group is a complete BCG chambered in 5.56x45mm NATO and engineered for the AR-15 platform. Carried as a full-auto compatible bolt carrier, it serves as the rugged cycling component at the heart of any AR-pattern upper receiver.

Measuring 1.75" x 3.80" x 10.65", this bolt carrier group drops directly into a standard AR-15 upper receiver. Its full-auto profile carrier gives builders a proven component geometry whether they are assembling a new AR-15 from the ground up or replacing a worn factory BCG.

Designed for use with 5.56 NATO ammunition and compatible .223 Remington loads, the Fail Zero FZM16401NH is a straightforward upgrade or replacement part for any AR-15 owner looking for a reliable, complete bolt carrier group ready to install.