Fail Zero M16/M4 Full-Auto BCG – EXO Nickel Boron | 5.56/.223/300 BLK Compatible
Full-Auto Rated. Friction-Free Cycling. Fail Zero Reliability.
The Fail Zero M16/4 Full-Auto BCG is a high-performance, drop-in bolt carrier group engineered for M16, M4, and AR-15 platforms. Whether you’re running full-auto, suppressed, or simply pushing high round counts, this mil-spec BCG delivers battle-ready durability, enhanced cycling, and cleaner operation—shot after shot.
Coated with Fail Zero’s patented EXO Nickel Boron (NiB) technology, this carrier group offers permanent dry lubricity, extreme wear resistance, and a low-friction surface that runs cooler, cleaner, and longer than standard phosphate or nitride carriers.
⚙️ Key Features:
✅ Drop-In Fit for M16, M4, and AR-15 Upper Receivers
✅ Full-Auto Rated M16 Cut Carrier – Compatible with select-fire and semi-auto platforms
✅ EXO Nickel Boron Coating on All Critical Components – Friction-free performance, easy cleaning
✅ Nickel Boron Treated Parts Include:
Bolt & Extractor (5.56 NATO / .223 Rem / 300 BLK)
Bolt Carrier
Cam Pin
Carrier Key
Firing Pin
✅ Corrosion & Heat Resistant – Ideal for suppressed or high-round-count rifles
✅ No Lube Required – Runs dry or with minimal lubrication
✅ Fully Assembled & Test-Fired – Ready for immediate installation
? Built for Duty, Defense & High-Performance Shooting
Whether you’re running a duty rifle, prepping for competition, or building a top-tier tactical AR, the Fail Zero M16/4 Full-Auto BCG provides the enhanced reliability and lower maintenance you expect from a professional-grade bolt carrier group.
The EXO Nickel Boron coating not only makes cleaning a breeze, but also provides smoother cycling and less internal wear—ensuring your rifle stays in the fight, round after round.
WARNING: This product can expose you to Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to – www.P65Warnings.ca.gov.
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