CMMG Resolute MK4 Upper Group .350 Legend 16.1 in

The CMMG Resolute MK4 Upper Group is a complete AR-platform upper chambered in .350 Legend designed for use with a standard AR-15 lower. It ships with a 16.1-inch barrel and includes a bolt carrier group and ZEROED accessories for straightforward integration into your build. The Armor Black Cerakote finish and free-float M-LOK handguard provide a practical balance of protection and modularity for hunting and range use.

Key Specifications

• The caliber is .350 Legend.
• The barrel length is 16.1 inches.
• The barrel twist rate is 1:16.
• The barrel material is 4140CM SBN.
• The operating system is Direct Impingement.
• The muzzle thread is 1/2 x 28.
• The gas port location is Carbine.
• The gas block is a 0.750 non-adjustable unit.
• The upper receiver is Billet 6061 T6 Aluminum.
• Includes a Bolt Carrier Group and ZEROED accessories, including a ZEROED AR-15 polymer dust cover, ZEROED ambidextrous charging handle and a ZEROED muzzle brake.

Built to integrate into standard AR-15 lowers, the Resolute MK4 upper offers a straightforward package for hunters and precision-minded shooters who prefer a purpose-built, no-nonsense component set. The Cerakote Armor Black finish and free-float M-LOK handguard support routine field use and accessory mounting, while the included bolt carrier group and ZEROED accessories reduce parts sourcing during assembly. This upper is ready to be the cornerstone of a reliable, single-caliber build.