Fail Zero 5.56mm NATO Bolt Carrier Group AR-15/M16 - Black Nitride Full Auto

The Fail Zero 5.56mm Bolt Carrier Group is a fully assembled, drop-in carrier designed for mil-spec AR-15, M4, and M16 upper receivers. Machined from 8620 steel and finished in Black Nitride, the carrier ships complete with a matching 5.56/.223 bolt and extractor and is ready to install into any standard platform upper.

Chambered for 5.56 NATO and fully compatible with .223 Remington, this unit is cut to the full-auto M16 profile with the heavier M16-style carrier mass for reliable cycling under hard use. All critical parts are coated with the Black Nitride finish for a durable, low-friction surface.

Whether you are building a new upper or replacing a worn carrier, this Fail Zero BCG gives AR-15, M4, and M16 platforms a drop-in mil-spec component that accepts standard gas keys, bolts, and firing pins.