CMMG Resolute Mk4 5.56mm 16.1" Rifle - Coyote Tan Finish

The CMMG Resolute Mk4 5.56mm rifle is a no-nonsense carbine built for hunters, sport shooters, and anyone who needs a versatile, dependable platform without excess bulk. Chambered in 5.56x45mm—one of the most proven and accessible rifle rounds in the world—this 16.1" rifle splits the difference between maneuverability and effective range, making it equally at home in the field, at the range, or as a core addition to any collection. With a direct impingement operating system and a mid-length gas system, the Resolute delivers reliable performance across a wide range of ammunition.

Built on CMMG's Mk4 platform, this rifle accepts standard AR15 accessories, so you're not locked into proprietary parts or limited by compatibility. The coyote tan Cerakote finish is both functional and distinctive. The EML15 M-LOK handguard strikes a practical balance—M-LOK slots at the 3, 6, 9, and 12 o'clock positions give you mounting options for lights, lasers, or grips while keeping weight down compared to full-length rail systems. All the essentials are here: a CMMG ZEROED muzzle brake, ambi charging handle, ambi safety selector, and RipStock carbine buffer tube with sling attachment plate.

This is a rifle that does its job without pretense. The forged 7075-T6 aluminum lower receiver and billet upper receiver provide a solid foundation, while the 4140CM chrome-moly barrel is threaded 1/2 x 28 for future muzzle device changes if you want them. Topped with a ZEROED drop-in trigger and packaged with a 30-round Magpul PMAG, the Resolute Mk4 is ready to go. At 6.4 lbs and 32.5" overall length, it's compact enough to handle but doesn't sacrifice the ballistic advantage of a longer sight radius and barrel.

Whether you're building your first serious rifle or adding a proven work gun to your safe, the Resolute Mk4 5.56mm delivers everything you need in a straightforward, no-drama package.

Key Features

• Direct impingement operating system with mid-length gas system for reliable cycling
• 16.1" 4140CM barrel with 1:7 twist—ideal for a wide range of 5.56 and compatible ammunition
• Mk4 platform accepts standard AR15 accessories for customization flexibility
• M-LOK handguard with slots at 3, 6, 9, and 12 o'clock for gear attachment
• Ambi charging handle and ambi safety selector for left- and right-handed shooters
• CMMG ZEROED muzzle brake (1/2 x 28 threads) for reduced recoil and muzzle rise
• RipStock carbine buffer tube with ambi sling attachment plate
• ZEROED drop-in trigger for out-of-the-box trigger performance
• Forged 7075-T6 aluminum lower receiver and billet 6061-T6 aluminum upper receiver
• Coyote tan Cerakote finish for durability and visual distinction
• Includes 30-round Magpul PMAG
• Compact 32.5" overall length and 6.4 lb weight for maneuverability

Specifications

Frequently Asked Questions

What accessories and components are compatible with the CMMG Resolute Mk4?

The Resolute Mk4 is built on the Mk4 platform and accepts standard AR15 accessories, including grips, stocks, optics mounts, lights, and rail-mounted gear. The EML15 handguard features M-LOK attachment points, so you can add lights, lasers, vertical grips, or other M-LOK accessories. The muzzle device is threaded 1/2 x 28, allowing you to swap or upgrade the brake if needed.

Is the CMMG Resolute Mk4 good for hunting?

Yes. The 5.56x45mm cartridge is widely used by hunters for varmint and small- to medium-game hunting, and the 16.1" barrel provides enough velocity and accuracy for those purposes. The rifle's compact size makes it easy to handle in the field, and the M-LOK handguard allows you to attach optics, lights, or other gear to suit your hunting setup.

What's included with the rifle?

The CMMG Resolute Mk4 comes with a 30-round Magpul PMAG, a CMMG ZEROED muzzle brake, CMMG ZEROED trigger, ambi charging handle, ambi safety selector, and RipStock. All the core components are installed and ready to use.

Who should choose the Resolute Mk4 over a full-size AR15?

The 16.1" carbine length works well for shooters who prioritize maneuverability and portability while still wanting the effective range and accuracy of a modern rifle platform. It's ideal if you're hunting from a vehicle, working in brush, or need a compact gun for home defense or sport shooting. You don't sacrifice the ballistic advantage of a proper barrel length, but you gain handling ease.