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The CMMG 65BA4D6 is a complete Mk3 bolt carrier group cut for 6.5 Creedmoor and .308 Winchester rifles running the DPMS/LR-308 pattern. It shows up as a full assembly, so there's no sourcing individual parts or piecing together a bolt. Pull it out of the package, wipe it down, lube it up, and it drops right into a compatible Mk3 or SR25/DPMS-pattern upper.
Where this BCG earns its keep is in the materials. The bolt is machined from 9310 steel with a phosphate finish, which is the same tough alloy you'll find on quality mil-spec bolts and holds up well against the extra pounding a large-frame cartridge dishes out. The carrier is 8620 steel, chrome lined on the inside for smoother cycling and easier cleanup, and finished in phosphate. Round it out with an S7 tool steel extractor and a 17-4 stainless firing pin, and you've got a group built to take heat.
The high-pressure designation isn't just marketing. The bolt and firing pin are engineered to cut down on primer cratering when you're feeding it warmer loads, which is a common headache on .308 and 6.5 Creedmoor builds pushing hotter pressures. If you're loading match ammo or handloads on the stout side, that little bit of extra margin matters.
This is a full-mass carrier meant for large-frame ARs, not an AR-15. It suits precision rigs, DMR-style setups, hunting builds, and general range guns chambered in 6.5 Creedmoor or .308. As always with LR-308 pattern parts, confirm your upper follows the same DPMS/SR25 spec since the large-frame world has a few variations floating around. CMMG backs the whole thing with their Lifetime Quality Guarantee, so it's built to be a set-and-forget piece of your rifle.
Yes. The 65BA4D6 is designed to run in either 6.5 Creedmoor or .308 Winchester chamberings since both share the same bolt face and case head dimensions on the large-frame platform. As long as your rifle follows the Mk3/LR-308 pattern, this group covers both cartridges.
It's built for the Mk3 and compatible DPMS Gen 1 high-profile and SR25-pattern large-frame uppers. The large-frame world has a couple of spec variations, so it's worth confirming your upper matches the LR-308 pattern before you order. If it does, this drops right in without fitting.
The high-pressure bolt and firing pin are engineered to reduce primer cratering when you're shooting hotter loads. That's a nice bit of insurance for match ammo and handloads that run on the warmer side. It helps keep function clean and consistent under heavier pressures common with .308 and 6.5 Creedmoor.
It arrives as a complete assembly with the carrier, bolt, staked gas key, firing pin, cam pin, and retaining pin all included. Just wipe off the packing oil, add fresh lube, and it's ready to go into your rifle. No extra parts or gunsmithing needed.
| UPC | 815835018997 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 65BA4D6 |
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