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FailZero built its whole reputation on Nickel Boron, and this full-auto profile 5.56 carrier is a solid example of why folks keep coming back. It ships fully assembled and drops right into most mil-spec M16, M4, or AR-15 upper receivers, so there's no fitting or fussing. The full-mass carrier adds a little weight over a lightweight profile, and that mass is part of what keeps the action running smooth and consistent round after round.
The standout here is the patented EXO Nickel Boron coating on all the critical parts, tucked underneath a black topcoat that cuts down on reflection. That coating gives the internals a permanent dry lubricity, so the bolt needs almost no oil to run and carbon has a hard time sticking to it. Owners who've run these for thousands of rounds regularly point out how quick they are to wipe down after a range day, which is the real day-to-day payoff of a good coated bolt.
The treated internals include the 5.56/.223 bolt, extractor, cam pin, carrier key, and firing pin, all coated in EXO before the black finish goes on top. One thing worth knowing up front: the black topcoat is on the outside for a non-reflective look, and high-contact wear points like the rails, ramps, and carrier ends will eventually show the silver Nickel Boron underneath as it breaks in. That's normal and expected, not a defect. The dust cover area and other non-wear spots keep their black finish.
This is the no-hammer version, so you won't find a hammer in the box. Some FailZero kits include a coated hammer, but this one is just the carrier group itself. It's a good fit if you already have a trigger group sorted and just want a quality bolt to finish a build or upgrade a tired factory carrier. And like the rest of the FailZero lineup, it's backed by a lifetime warranty, which says a lot about how they stand behind the coating.
No. The full-auto or M16 profile just refers to the shape and mass of the carrier, not the fire control. Dropped into a standard semi-auto AR-15, it functions as a semi-auto carrier and simply gives you a bit more carrier mass for smooth, consistent cycling.
That's completely normal. The black topcoat sits on top of the EXO Nickel Boron, and high-contact wear areas like the rails, ramps, and carrier ends will rub through to reveal the silver Nickel Boron underneath as the bolt breaks in. Non-wear areas such as the dust cover section keep their black finish.
No, this is the no-hammer version, so a hammer is not included in the box. Some FailZero kits ship with a coated hammer, but this SKU is just the bolt carrier group. It's a good pick if your trigger group is already handled and you just need a quality bolt.
It does. The EXO coating gives the parts a permanent dry lubricity, so carbon has a much harder time sticking and most of it wipes right off. Plenty of owners running these over thousands of rounds note the shorter cleaning time, and the bolt needs very little oil to run reliably.
| UPC | 094922014276 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | FZ-M16/4-01-NH-BLACK |
| Color | Black |
| Length | 10.3000 |
| Model | |
| Product Type | Bolt Carrier Group |
| Shipping Weight | 0.805 |
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