The CMMG Mk3 Lower Receiver Sub-Assembly (brand part no. 38CA2ACAB) is the serialized starting point for an AR-10-style .308 Winchester build, based on the DPMS LR308 Gen 1 high pattern design that’s compatible with the most common and popular .308 AR parts on the market. CMMG built this receiver to give builders room to keep a Mk3 project simple or take it in a fully custom direction, since parts compatibility across the DPMS-pattern ecosystem is broad. Finished in Armor Black, it’s a solid foundation for anyone starting a .308 AR-10-style build from the receiver up.

Key Specifications

• Sold as a lower receiver sub-assembly — the serialized firearm itself.
• Chambered for .308 Winchester/7.62 NATO AR-10-style builds.
• Based on the DPMS LR308 Gen 1 high pattern design.
• Compatible with common .308 AR parts across the DPMS-pattern ecosystem.
• Finished in Armor Black.
• Shipping weight of approximately 0.9 pounds.

Frequently Asked Questions

What pattern is this receiver based on? The DPMS LR308 Gen 1 high pattern, compatible with common .308 AR parts.

Is this a serialized firearm or a stripped part? This lower receiver sub-assembly is the serialized firearm.

Buy the CMMG Mk3 Lower Receiver Sub-Assembly

Start your .308 build on a receiver from CMMG. Order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL, and see our full AR-10 lower selection.