CMMG Resolute MK4 Upper Group .350 Legend 16.1in

The CMMG Resolute MK4 Upper Group is a complete AR-platform upper chambered in .350 Legend, built to mate with any standard AR-15 lower. This upper includes a 16.1-inch barrel, a CMMG EML15 M-LOK free-float handguard, a bolt carrier group, and ZEROED accessories for straightforward integration into your next build. Construction uses a billet 6061 T6 aluminum upper and a 4140CM SBN barrel, with a Cerakote Armor Black finish option.

Key Specifications

• Chambered for .350 Legend for straight-walled cartridge compatibility.
• The barrel measures 16.1 inches to balance maneuverability and ballistic performance.
• The barrel twist rate is 1:16.
• The barrel material is 4140CM SBN.
• The operating system is Direct Impingement.
• The muzzle device is a CMMG ZEROED Muzzle Brake with 1/2 x 28 muzzle threads.
• The gas port location is set to Carbine.
• The gas block is a 0.750 inch non-adjustable unit.
• The upper receiver is machined from billet 6061 T6 aluminum.
• The handguard is a CMMG EML15 M-LOK free-float design in Armor Black finish.

Designed for builders and shooters who value a robust, ready-to-install upper, the Resolute MK4 pairs practical features with durable materials and a streamlined accessory package. Its free-float handguard and billet receiver provide a stable mounting platform for optics and accessories, while the included bolt carrier group and ZEROED components reduce the parts you need to source separately. The result is a versatile upper well-suited to hunting with straight-walled cartridges, range work, and a wide range of AR builds.