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FailZero built its reputation on Nickel Boron, and this M16/4 Full-Auto BCG is the piece that put them on the map. It ships completely assembled and ready to drop into most mil-spec M16, M4, and AR-15 upper receivers, so you can pull your old carrier and run this one the same afternoon. Every critical part gets treated with the patented EXO Nickel Boron coating, which gives you permanent dry lubricity, better corrosion resistance, and a surface that holds up round after round. The finish on this thing is slick, and it stays that way.
EXO Nickel Boron isn't just a looks upgrade. The bolt, extractor, firing pin, cam pin, bolt carrier, and carrier key are all coated, which means the whole assembly runs with less friction and needs far less oil to keep cycling smoothly. Carbon and fouling wipe right off the slick surface, so cleaning is quicker and you spend less time scrubbing at the bench. Plenty of owners report thousands of rounds with only minor maintenance and no drop in reliability.
The carrier is machined from 8620 steel in the full-auto M16 profile, and the bolt is Carpenter 158 steel that's shot peened and HPT/MPI tested for strength you can count on. The gas key is fastened with Grade 8 hardware and properly staked to spec. The bolt and extractor are compatible with 5.56 and .223, and the full-auto carrier weight helps keep timing consistent and cycling smooth.
Whether you're upgrading an existing rifle or finishing a fresh build, this is a proven drop-in for standard mil-spec uppers. It's made 100% in the USA and laser-etched with the FailZero logo. If you want a carrier group that runs cleaner, cycles slicker, and asks for almost nothing in the way of lube, this one earns its spot.
Yes. This is a standard full-auto M16-cut carrier that drops into most mil-spec M16, M4, and AR-15 upper receivers. The full-auto cut runs fine in semi-auto rifles, so it works whether your rifle is semi-only or select-fire. No fitting or headspacing is needed since it ships fully assembled.
The EXO Nickel Boron coating provides permanent dry lubricity, so it runs with far less oil than a standard phosphate carrier. A lot of owners run it nearly dry with only light maintenance and see smooth cycling for thousands of rounds. A little lube on the wear points never hurts, but you won't need to drench it.
The bolt and extractor are built for 5.56 NATO and .223 Remington. Since .300 Blackout uses the same bolt face, this carrier group works for that chambering as well. Match the barrel and gas system to your caliber and this BCG will handle the rest.
The slick EXO surface keeps carbon and fouling from sticking, so most of it wipes right off with a rag. That means less time scrubbing at the bench and quicker turnaround after a range day. It's one of the main reasons people upgrade to a FailZero carrier in the first place.
| UPC | 881314861781 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 009-FZM16/4-01-NH |
| Color | AR15 COMPLETE BOLT CARRIER |
| Length | 10.6500 |
| Model | |
| Product Type | Bolt Carrier Group |
| Shipping Weight | 0.815 |
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