CMMG RESOLUTE MK4 Upper 6.5 Grendel 16.1 BLK

Designed around the 6.5 Grendel cartridge for flat shooting at medium to long ranges, the RESOLUTE Mk4 Upper Group mounts to any standard AR15 lower and provides a complete upper assembly. This upper ships complete with a bolt carrier group and ZEROED accessories including a polymer dust cover, ambidextrous charging handle, and a CMMG ZEROED muzzle brake. The Mk4 platform components and Cerakote finish are intended to balance durability and corrosion resistance for field use.

Key Specifications

• Caliber is 6.5 Grendel.
• Platform is Mk4.
• Operating system is Direct Impingement.
• Barrel length is 16.1.
• Barrel twist is 1:8.
• Barrel material is 416SS SBN.
• Muzzle device is CMMG ZEROED Muzzle Brake.
• Muzzle thread is 5/8 x 24.
• Upper receiver is Billet 6061 T6 Aluminum.
• Hand guard is CMMG EML15 M-LOK.

The RESOLUTE Mk4 upper group provides a turnkey option for shooters seeking the external configuration and parts compatibility of an AR15 upper with the ballistics of 6.5 Grendel. Its combination of a stainless barrel, billet receiver, and integrated ZEROED components makes it suitable for precision-oriented medium-range applications where a high-quality, ready-to-install upper is required.