Fail Zero Lightweight Bolt Carrier Group 5.56x45mm NATO AR-15 - No Hammer - EXO Nickel Boron

The Fail Zero Lightweight Bolt Carrier Group is a precision-engineered, low-mass BCG built for 5.56x45mm NATO AR-15, M4, and M16 platforms. Designed for shooters who want to reduce reciprocating mass without sacrificing reliability, this BCG comes fully assembled and ready to drop into any mil-spec upper receiver.

All critical working surfaces are treated with Fail Zero's signature EXO Nickel Boron coating, delivering a high-polish, self-lubricating finish that dramatically cuts friction between the bolt, carrier, and receiver rails. The coating resists carbon fouling and corrosion, allowing the BCG to run cleaner with minimal lubrication through thousands of rounds. The result is smoother cycling, easier cleaning, and outstanding long-term durability.

The lightweight carrier is machined from 8620 steel, with the bolt and internal components crafted from hardened steel. This design achieves a 21% weight reduction compared to a standard Mil-Spec carrier - the carrier itself weighs just 6.4 oz, with the complete BCG tipping the scales at only 9.2 oz. Reducing reciprocating weight translates to faster follow-up shots, decreased bolt bounce, and snappier overall handling. This model ships configured with no hammer, making it the ideal match for semi-automatic AR-15 builds.

Fully compatible with all Mil-Spec AR platforms chambered in 5.56x45mm NATO (and rated for .300 AAC Blackout as well), the Fail Zero Lightweight Bolt Carrier Group is a turn-key upgrade for any build where weight savings, easy maintenance, and proven reliability are top priorities.