CMMG Resolute Mk3 16.1-Inch Upper Group, .308 WIN Black

The CMMG Resolute Mk3 Upper Group in .308 WIN (brand part no. 38B7D78AB) is built for shooters who want the ultimate .308 carbine without the confusion that usually comes with .308 AR platform compatibility. CMMG based the Mk3 platform on the popular Gen 1 DPMS high-pattern LR308 design specifically to keep things simple, which means greater parts availability and more customization potential down the road. This upper group ships complete with a bolt carrier group and CMMG’s ZEROED accessories, including a Mk3 polymer dust cover, a .308 ambi charging handle, and a muzzle brake, so there’s nothing extra to track down. It runs a 16.1-inch, 416SS SBN barrel with a 1:10 twist on a direct impingement operating system, a 0.750-inch non-adjustable gas block fed from the rifle gas port location, a billet 7075 T6 aluminum upper receiver, and a CMMG EML15 M-LOK handguard finished in standard Cerakote. Overall upper length runs approximately 28.3 inches and it weighs about 5.8 pounds. At 16.1 inches, this barrel clears the federal 16-inch rifle minimum, so this upper group can be run on a standard rifle-configured lower with no NFA registration required.

Key Specifications

• Chambered in .308 WIN on the Mk3 platform, based on the DPMS Gen 1 high-pattern design.
• 16.1-inch barrel length with a 1:10 twist rate.
• Barrel material: 416SS SBN, direct impingement operating system.
• Ships complete with a bolt carrier group and CMMG ZEROED accessories.
• Upper receiver: billet 7075 T6 aluminum.
• Handguard: CMMG EML15 M-LOK.
• Overall length approximately 28.3 inches, weighing about 5.8 pounds.
• Finished in standard Cerakote.

Frequently Asked Questions

Does this upper group include a lower receiver? No, this is an upper group only and requires a compatible AR-10/.308 lower to complete a firearm.

Is this barrel length legal on a standard rifle lower? Yes, at 16.1 inches it clears the federal 16-inch rifle minimum with no NFA registration required.

What receiver pattern is this upper built to? It’s built on CMMG’s Mk3 platform, based on the popular DPMS Gen 1 high-pattern LR308 design for broad parts compatibility.

Buy the CMMG Resolute Mk3 Upper Group

Order it from our Lubbock, Texas gun shop for fast, direct shipping to your door, and build the ultimate .308 carbine on a proven, parts-compatible platform.

Shop more from CMMG and browse our full AR10 uppers selection.