The CMMG Resolute Mk4 in 6.5 Grendel (MPN 64AEF0CAB) capitalizes on the ballistic performance and efficiency of 6.5mm bullets, a flat-shooting round originally developed specifically for AR-15 platform rifles at medium to long range. CMMG builds the 16.1-inch barrel from 416 stainless steel with a nitride finish and a 1:8-inch twist, threaded 5/8×24 for the CMMG ZEROED muzzle brake, running a non-adjustable 0.750 gas block. The rifle carries a billet 6061-T6 aluminum upper over a forged 7075-T6 Mk4 lower, ambidextrous charging handle and ZEROED pistol grip, a drop-in trigger, and the CMMG RipStock on a 6-position Fastback receiver extension. Among AR-platform rifles in the AR rifles category, the Resolute Mk4 favors hunters and long-range shooters who want 6.5mm ballistic efficiency in a feature-packed AR without a custom-rifle price tag.

Key Specifications

• Chambered in 6.5 Grendel with a 1:8-inch rate of twist.
• Features a 16.1-inch nitride-finished 416 stainless barrel.
• Upper receiver is billet 6061-T6 aluminum; lower is forged 7075-T6.
• Includes the CMMG ZEROED muzzle brake, threaded 5/8×24.
• The stock is the CMMG RipStock on a 6-position Fastback extension.
• The trigger and pistol grip are CMMG ZEROED components.
• The charging handle is CMMG ZEROED ambidextrous.
• Feeds from a 10-round CMMG magazine.
• Weighs approximately 6.4 pounds, 32.5 inches overall.

Frequently Asked Questions

Why choose 6.5 Grendel? It delivers flat-shooting, efficient ballistic performance at medium to long range from a standard AR-15 platform.

What stock does this rifle use? The CMMG RipStock on a 6-position Fastback receiver extension.

What is the magazine capacity? A 10-round CMMG magazine.

Buy the CMMG Resolute Mk4 6.5 Grendel

6.5mm ballistic efficiency in a feature-packed AR without a custom-rifle price tag is exactly what the Resolute Mk4 delivers. Order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL.