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Running a big-bore .458 SOCOM build means your bolt carrier group takes a beating, and Fail Zero designed this one to keep up. It arrives fully assembled and drop-in ready for most mil-spec .458 SOCOM upper receivers, so you can pull it out of the package and get to work without a bunch of fitting or fuss. The carrier is machined from 8620 Carpenter steel in the M16 style, giving you the full mass and reliable cycling that heavy thumpers like the .458 need.
The real standout here is Fail Zero's patented EXO Nickel Boron treatment. Every critical part gets coated, including the bolt, extractor, bolt carrier, cam pin, carrier key, and firing pin. That coating gives you permanent dry lubricity, which means less friction, smoother cycling, and a whole lot less scrubbing when it comes time to clean. Nickel Boron surfaces shed carbon and fouling with a quick wipe, and the silver finish holds up against wear and corrosion far better than plain phosphate.
This is a complete bolt carrier group with the bolt, carrier, cam pin, firing pin, and retaining pin all in place. The bolt is compatible with both .458 SOCOM and .450 Bushmaster, so it covers a couple of popular big-bore chamberings. Each unit is magnetic particle inspected and high pressure tested, so the parts that see the most stress have been checked before they ever leave the shop. Fail Zero has been a pioneer in Nickel Boron technology for a long time, and their carriers are made in North Carolina.
Keep in mind this is the No Hammer configuration, so you're getting the carrier group on its own without a hammer in the package. If you're upgrading an existing .458 build or finishing out a fresh upper, this is a clean, reliable choice that treats maintenance like an afterthought.
Yes, it comes fully assembled and is designed to drop into most mil-spec .458 SOCOM upper receivers with no fitting required. It uses a standard M16-style carrier, so it works the same way a standard AR carrier does. Just make sure your upper is set up for the .458 SOCOM platform.
It does. The bolt on this Fail Zero group is compatible with both .458 SOCOM and .450 Bushmaster, since the two cartridges share the same case head dimensions. That makes it a flexible option if you run either of those big-bore chamberings.
The EXO Nickel Boron treatment gives the critical parts permanent dry lubricity, which cuts down on friction and helps the action cycle smoothly. It also boosts wear and corrosion resistance and makes cleaning much easier since carbon and fouling wipe right off. Many folks find they can run these carriers with very little added lube.
No, this is the No Hammer configuration, so a hammer is not part of the package. You're getting the complete bolt carrier group only, which is ideal if your lower is already built out. If you need a hammer, you'll want to source one separately.
| UPC | 094922014931 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | FZ-458-01-NH |
| Color | AR15 COMPLETE BOLT CARRIER |
| Length | 10.1000 |
| Model | |
| Product Type | Bolt Carrier Group |
| Shipping Weight | 0.814 |
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