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The WMD Guns NiB-X Complete Bolt is a ready-to-run 5.56 bolt assembly built for anyone putting together a fresh AR-15 upper or replacing a tired bolt. It arrives with the extractor, ejector, gas rings, and special O-ring buffer already installed, so you drop it into your carrier and you're squared away. It's cut for 5.56 NATO, .223 Remington, and 300 Blackout, which covers a lot of the common direct-impingement builds out there.
What sets this one apart is the coating. WMD builds the bolt from case-hardened 9310 steel that's shot peened and magnetic particle inspected, then finishes it in their proprietary NiB-X nickel boron. That surface runs harder than chrome and about 40 percent more wear resistant, so it holds up round after round without a lot of babying.
Nickel boron is naturally slick, which does two nice things. First, it keeps friction down so the bolt cycles smoothly, even when you're running dry with little to no lube. Second, carbon has nowhere to grab hold, so fouling wipes right off with a rag or a nylon brush instead of a scrubbing session. That's a real advantage on suppressed guns and short-barreled setups where things get dirty fast.
This is the bolt assembly on its own, not a full bolt carrier group, so it's a smart pick if you already have a carrier you like or you're swapping out just the bolt. The 9310 material is a tough, ductile steel that stands up well to the lugs taking a beating during lockup and unlocking against the barrel extension. The engineered fit means it seats and locks the way it should with mil-spec barrel extensions. If you want a bolt that lasts, cleans easy, and keeps your rifle running when the range day gets long, this one earns its keep.
This is the complete bolt assembly only, not a full bolt carrier group. It includes the bolt with the extractor, ejector, gas rings, and O-ring buffer already installed, but no carrier, gas key, cam pin, or firing pin. It's meant for anyone replacing a bolt or building on a carrier they already own.
It's built for 5.56 NATO, .223 Remington, and 300 AAC Blackout. Those three share the same bolt face, so one assembly covers all of them in a standard direct-impingement AR-15.
Yes, that's one of the biggest draws. The nickel boron surface is slick and doesn't give carbon anywhere to stick, so most of the fouling wipes off with a rag or nylon brush instead of heavy scrubbing. The lubricity also lets it run smoothly with minimal oil.
The bolt is made from case-hardened 9310 steel that's shot peened and magnetic particle inspected for strength and consistency. The NiB-X coating runs harder than chrome and roughly 40 percent more wear resistant, so it holds up to a lot of rounds before showing wear.
| UPC | 855899003232 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 1-NIBXBA556 |
| Color | Silver |
| Product Type | Bolt Action |
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