CMMG Resolute MK4 Upper | 6mm ARC | 16.1 in

The CMMG Resolute MK4 Upper Group is a complete AR-15 pattern upper chambered in 6mm ARC and fitted with a 16.1-inch stainless barrel. It ships with CMMG ZEROED accessories including an ambidextrous charging handle, polymer dust cover, and a CMMG ZEROED muzzle brake to support reliable function out of the box. Built on a billet 6061 T6 aluminum receiver and finished in Cerakote, this upper is intended to pair with standard AR-15 lowers to provide 6mm ARC capability.

Product Specifications

• Chambered in 6mm ARC to bring advanced ballistic performance to AR-15 platforms.
• The barrel measures 16.1 inches for a balance of maneuverability and velocity.
• The barrel twist is 1:7.5, as supplied by the manufacturer.
• The barrel contour is MT to match the Resolute profile.
• The barrel is made from 416SS SBN material.
• The operating system is Direct Impingement for standard AR-15 compatibility.
• Includes the CMMG ZEROED Muzzle Brake as the factory muzzle device.
• The muzzle threads are 5/8 x 24.
• The gas port location is set to Rifle.
• The gas block is a 0.750 Non-Adjustable style.
• The upper receiver is Billet 6061 T6 Aluminum.
• The hand guard is a CMMG EML15 M-LOK free-floating design.
• The finish is listed as Cerakote Standard.
• The charging handle provided is the CMMG ZEROED Ambi.
• The UPC is 810097504660.

This Resolute MK4 upper gives you a factory-complete solution for adding 6mm ARC performance to an AR-15 lower; it is suited to precision and long-range target work as well as field use where flat-shooting cartridges are desirable. The combination of a stainless-profile barrel, M-LOK hand guard, and factory ZEROED accessories delivers a ready-to-run upper group engineered for accuracy and reliable operation.