CMMG Resolute Mk4 6.5 Gren 16.1" Rifle - Coyote Tan

The CMMG Resolute Mk4 6.5 Grendel 16.1" rifle in coyote tan is a compact, modern carbine built for shooters who need genuine long-range capability without the bulk of a full-size platform. Designed around the 6.5 Grendel cartridge—a round originally engineered for AR-platform rifles—the Resolute delivers flat-shooting ballistics and serious downrange energy in a 16.1" barrel package that works equally well from a truck, a stand, or tight hunting country. At 6.4 pounds and 32.5" overall length, this is a rifle that bridges the gap between nimble handling and the performance you can't get from a pistol or short-barreled rifle.

CMMG equipped the Resolute Mk4 with their curated ZEROED parts ecosystem: a direct impingement operating system, a non-adjustable gas block tuned for reliability, ambidextrous charging handle, drop-in trigger, and 60/90-degree safety selector. The upper receiver is billet-machined 6061-T6 aluminum, the lower is forged 7075-T6, and the 416 stainless 1:8-twist barrel wears a CMMG muzzle brake (5/8x24 thread). The EML15 handguard strips weight with selective M-LOK slots at 3, 6, 9, and 12 o'clock—room for lights, grip panels, or optic mounts without unnecessary rail bulk.

The RipStock and fastback receiver extension give you adjustability for fit, while the coyote tan Cerakote finish resists corrosion in field conditions. This is a rifle that works: no custom rifle price tag, no surprises, just proven parts assembled to do the job. Whether you're reaching out past 300 yards or hunting in dense cover, the Resolute Mk4 6.5 Grendel is genuinely useful.

Key Features

• 6.5 Grendel caliber—flat-shooting, medium-to-long-range ballistics in an AR-platform rifle
• Compact carbine form factor: 16.1" barrel, 32.5" overall length, 6.4 lbs—nimble enough for hunting, potent enough for distance
• Direct impingement, non-adjustable gas block, fixed rifle gas port for reliable operation
• Billet upper and forged lower receivers in premium aluminum alloys
• CMMG EML15 M-LOK handguard with 4-position mounting for accessories
• CMMG ZEROED muzzle brake (5/8x24 thread) reduces recoil and muzzle rise
• Ambidextrous charging handle and 60/90-degree safety selector for left or right-hand shooters
• Drop-in ZEROED trigger for clean break out of the box
• RipStock receiver extension with sling plate and adjustment positions
• Coyote tan Cerakote finish for field durability
• Ships with 10-round magazine

Specifications

Frequently Asked Questions

What is 6.5 Grendel and why choose it?

6.5 Grendel is a mid-range rifle cartridge engineered specifically for AR-15 platforms. It delivers flat ballistics and impact energy beyond what .223 or 5.56 can achieve, with less recoil and powder consumption than larger rounds like .308. It's ideal for hunting medium game at extended range or precision shooting past 300 yards without the heft of a full-size rifle.

Is the CMMG Resolute Mk4 ambidextrous?

The rifle features an ambidextrous charging handle, 60/90-degree ambidextrous safety selector, and an ambidextrous sling plate on the receiver extension, making it accessible to both right and left-hand shooters.

What's included with the rifle?

The Resolute Mk4 ships with a 10-round magazine, CMMG ZEROED muzzle brake, and all controls and furniture specified above. Optics and additional magazines are sold separately.

Can I mount a scope or red dot on the EML15 handguard?

The EML15 handguard features M-LOK attachment slots at the 3, 6, 9, and 12 o'clock positions, allowing you to mount lights, grips, or other M-LOK accessories. For optics, you will use the upper receiver's picatinny rail.