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Faxon's FF556BCGCNITRIDE is a full carrier group that takes the standard mil-spec recipe and tightens up the parts that matter most. The bolt is machined from 9310 tool steel, which runs stronger than the common C158 material you'll find in a lot of budget carriers, and every bolt gets magnetic particle inspected to catch any hidden flaws before it leaves the shop. Add in full mil-spec heat treatment, shot peening, and back-of-lug chamfering, and you've got a carrier group ready for high round-count use whether you're building a training gun, a competition rig, or a home-defense AR.
The bolt and carrier both get a salt bath nitride treatment, which bumps up surface hardness and shrugs off corrosion far better than typical phosphate or chrome finishes. On top of that, the carrier body wears Faxon's Superfinish, a polished surface that cuts friction and gives carbon fewer places to grab hold. The real-world payoff shows up at the cleaning bench, where fouling tends to wipe right off instead of caking on. Folks running these report noticeably smoother cycling and easier maintenance session after session.
This is an M16-pattern carrier, so it's full-auto compatible and keeps the trip surface for full-auto fire control groups and modern multi-stage triggers. It also carries forward assist serrations. The gas key is secured with grade 8 fasteners and properly staked to stay put over the long haul. Because it shares the same bolt face, this group handles .223 Rem, 5.56x45mm NATO, and .300 Blackout, making it a flexible choice for more than one build.
As with any quality bolt, headspace should be checked when you're pairing it with a barrel that hasn't been matched by Faxon. A quick check with a proper headspace gauge before you run it hard is cheap insurance for reliable, safe function down the line.
Yes. This carrier group shares the same bolt face as 5.56, so it runs .223 Rem, 5.56x45mm NATO, and .300 Blackout without swapping parts. It's a common pick for folks building or switching between those calibers on the AR-15 platform.
It is. This is an M16-pattern carrier that keeps the full-auto trip surface, so it works with full-auto fire control groups and modern multi-stage triggers. It also has forward assist serrations, just like a standard mil-spec M16 carrier.
If you're pairing it with a barrel that Faxon didn't headspace as a matched set, yes, you should check it with a proper headspace gauge before firing. It's a quick step that confirms safe, reliable function. Buyers who ran it with Faxon match barrels have reported headspace coming out spot on.
9310 tool steel is stronger than the common C158 material used in a lot of standard bolts, which helps with durability under high round counts and high-pressure loads. Every Faxon bolt is also magnetic particle inspected to verify the material is sound. Combined with the shot peening and back-of-lug chamfering, it's built for hard use.
| UPC | 816341020870 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | FF556BCGCNITRIDE |
| Color | Black |
| Length | 2.8500 |
| Model | |
| Product Type | Bolt Carrier Group |
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