Description
MPN: 65BA4D6
FEATURES:
- Built for Large-Frame ARs: Designed for CMMG Mk3™ and compatible .308 / 6.5 Creedmoor (SR25 / DPMS-pattern) rifles
- Complete Bolt Carrier Group: Includes carrier, bolt, firing pin, cam pin, and retaining pin—ready for drop-in use
- Precision-Machined Components: Manufactured to tight tolerances for reliable cycling and consistent performance
- Durable Steel Construction: Built to handle higher pressures and forces associated with .308 and 6.5 Creedmoor platforms
- Reliable Extraction & Ejection: Engineered for dependable function across a variety of ammunition types
- Smooth Operation: Designed for consistent lockup and cycling in properly tuned gas systems
- Lifetime Quality Guarantee: Backed by CMMG’s Lifetime Quality Guarantee
- Made in the USA: Manufactured with quality-focused standards
SPECIFICATIONS:
- Caliber: .308 Win / 7.62 NATO / 6.5 Creedmoor
- Weight: 18.8 oz.
- Finish: Phosphate
- Material:
- Bolt Carrier: 8620 Steel
- Bolt: 9310 Steel
- Extractor: S7 Tool Steel
- Firing Pin: 17-4 Steel
- Profile: Full-Auto
**A full-auto (A.K.A. M16) bolt carrier installed in a standard semi-auto AR-10 will not make the gun fire full-auto.
COMPATIBILITY:
- DPMS Gen I pattern LR308 rifles
*Will not fit DPMS Gen 2 pattern rifles
INCLUDES:
- 1x Bolt Assembly
- 1x Extractor
- 1x Cam Pin
- 1x Bolt Carrier
- 1x Carrier Gas Key
- 1x Firing Pin
- 1x Firing Pin Retaining Pin
DETAILS:
The CMMG Mk3 Bolt Carrier Group for .308 / 6.5 Creedmoor is designed for shooters who want their rifle to run without constant tuning or second-guessing. Large-frame ARs can be less forgiving than AR-15s, and the BCG is where problems usually show up first. This one is built around proper dimensions and fit for Mk3-pattern rifles, keeping cycling consistent whether you’re running .308 or pushing higher-pressure 6.5 Creedmoor loads.
High-Pressure Design That Actually Matters
One detail that sets this BCG apart is its high-pressure bolt design. It uses a 0.060" firing pin paired with a narrowed firing pin channel, which helps reduce primer cratering when shooting higher-pressure cartridges like 6.5 Creedmoor.
That’s not just a spec—it’s something you’ll appreciate if you’ve ever seen flattened or cratered primers on large-frame guns. It adds a layer of confidence when running hotter loads or stretching the rifle out at distance.
Smooth Cycling With Proper Mass And Geometry
Carrier weight and geometry are tuned for the Mk3 system, helping the rifle cycle smoothly without feeling overly violent or sluggish. When paired with the right buffer setup, the action feels controlled and predictable—especially noticeable during faster follow-up shots or suppressed use.
Designed For Mk3 And Common Large-Frame Patterns
This BCG is built for CMMG Mk3 platforms and works with most SR25 and DPMS-pattern LR-308, giving it flexibility across a wide range of large-frame builds.
A Component You Don’t Want To Compromise On
When the BCG is right, the rifle just runs. When it isn’t, everything feels off. This one focuses on the details that matter—proper fit, controlled cycling, and handling higher-pressure loads without issues.
If you’re building or upgrading a .308 or 6.5 Creedmoor AR, the CMMG Mk3 BCG is a dependable choice that keeps your rifle running clean and consistent when it counts.
