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CMC has been in the AR game a long time, best known for their drop-in triggers, and that same aerospace-rooted attention to detail carries straight into this enhanced bolt carrier group. It's built for AR-10 and LR-308 pattern rifles chambered in .308 Winchester and 6.5 Creedmoor, and it's tuned specifically for folks running a suppressor or a shorter barrel where reliable extraction really matters.
The standout here is the carrier design. CMC flared the rear of the carrier to fight carrier tilt and cant during recoil, relocating the key bearing surfaces so the action rides smoother against the upper. Fewer contact points means less friction area, and the extra mass helps keep gas pressure and dwell time in the right window. That's what makes this thing feed and extract so consistently when you've got a can hanging off the muzzle or you're shooting an SBR. Enlarged forward ports round out the suppressor-friendly package.
The carrier is machined from case-hardened 8620 steel, while the bolt is cut from 9310 case-hardened steel, then shot peened and coated in black nitride for hardness and corrosion resistance. That trumpet area behind the gas rings, where carbon loves to build up, gets CNC-ground after heat treatment so cleanup is quick and the parts last. The bolt holds true mil-spec dimensions with tight tolerances, so it drops into standard AR-10 uppers without drama.
Every unit gets magnetic particle inspected (MPI) and high-pressure tested (HPT), so you know the bolt has been checked for hidden flaws before it ships. Add the hardened 4340 cam pin, mil-spec 8740 steel firing pin, and a mil-spec extractor spring with O-ring, and you've got a complete, reliable heart for your big-bore build. The black nitride finish also stays low-visibility compared to a shiny chrome or nickel carrier, which is a nice touch if you're going for a subdued look.
It's built to the DPMS / SR-25 (Gen 1) pattern, which is the most common big-bore standard by a wide margin, so it drops into the majority of AR-10 and LR-308 uppers. It holds true mil-spec dimensions for that pattern. It is not made for DPMS Gen 2 rifles or the original Armalite AR-10, so double check which pattern your upper is before ordering.
This BCG is set up for .308 Winchester, 7.62 NATO, and 6.5 Creedmoor. Those cartridges share the same bolt face and case head, so the same bolt handles all three. Just match it to a barrel in your chosen chambering.
That's the whole point of the enhanced design. The added carrier mass and increased dwell time help keep timing right when a suppressor bumps up back pressure, and the enlarged forward ports and flared rear work together to keep things running clean and reduce carrier tilt. It's a solid pick for cans and short-barreled .308 builds.
Yes. Every bolt is magnetic particle inspected (MPI) and high-pressure tested (HPT) before it leaves the factory, so any hidden cracks or flaws get caught early. Between that testing and the 9310 steel, shot peening, and nitride coating, it's built to hold up over a long round count.
| UPC | 810943030985 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 81633 |
| Shipping Weight | 1.231 |
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