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The bolt is the hardest-working part of your AR-15. It locks into the barrel extension, extracts the spent case, and slams a fresh round home thousands of times over the life of the rifle, all under real pressure. Faxon built this one to shrug off that abuse. It starts with 9310 tool steel, an aerospace-grade alloy that runs roughly 7 to 8 percent stronger than the Carpenter 158 that mil-spec calls for, then adds a salt bath nitride finish that boosts surface hardness, cuts friction, and fights corrosion far better than the old manganese phosphate coating.
Every bolt goes through magnetic particle inspection to confirm the material is sound and free of hidden flaws, which is exactly the kind of quality check you want on a part that sees this much stress. The bolt lugs are chamfered at 45 degrees to keep the action cycling reliably, even with hot handloads or fast, lightweight carriers. That chamfer is a small detail that pays off when you're running the gun hard and want lockup to stay consistent round after round.
Faxon didn't cut corners on the extraction system either. The extractor is machined from S7 tool steel, fully heat-treated and shot-peened, then tensioned with a spring, o-ring, and silicone insert for a firm, dependable grip on the case rim. Weak extraction is one of the most common reliability headaches on an AR, so upgrading to a beefier setup here is money well spent.
This is a complete bolt assembly built for standard 5.56 NATO and .223 AR-15 platforms, and it also handles .300 Blackout since they share the same bolt face. It drops right into any mil-spec carrier, making it a straightforward upgrade whether you're refreshing a high round-count rifle or building something new from the ground up. Faxon backs it with a lifetime guarantee against manufacturing and material defects to the original owner. For a competition gun, a defensive build, or a range rifle you plan to run into the ground, it's a smart piece of insurance.
Yes. This is a complete bolt assembly that drops into any standard mil-spec 5.56 AR-15 carrier. It's a common swap when you want to refresh a worn bolt or upgrade the material in a carrier you already own. Installation is straightforward with basic AR tools.
When properly heat-treated, 9310 runs about 7 to 8 percent stronger than Carpenter 158, which is the mil-spec standard. Faxon completes the heat-treat with full certifications and still shot-peens and MPI tests each bolt, so you get the strength benefit with the quality control that matters most. Both alloys are excellent when made right, but 9310 gives you a bit more margin at the lugs.
Yes. The 5.56 NATO and .300 Blackout share the same bolt face, so this bolt functions in both. That makes it a versatile pick if you run multiple uppers on a single lower.
The salt bath nitride treatment increases surface hardness, reduces friction, and gives much better corrosion resistance than the older phosphate coatings. In practice that means smoother cycling and easier cleaning, since fouling doesn't grip as hard to the slicker surface. It also holds up well in humid or dirty conditions.
| UPC | 816341020863 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | FF556BCNITRIDE |
| Product Type | Bolt Action |
| Color | Black |
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