Cmmg Resolute 28A670Cmb Mk4 22Arc 16.1 Mdbrz

The CMMG Resolute 28A670Cmb Mk4 in .22 ARC is a modern carbine-length AR-15 built for shooters who need serious long-range ballistic performance without the weight and bulk of a full-size rifle. .22 ARC is the next-generation .22 caliber AR platform option, engineered to deliver .22-250–class ballistics from a standard AR-15 receiver. Whether you're working a backyard range or hunting medium game at distance, this rifle bridges the gap between compact carbines and dedicated long-range guns—giving you precision firepower in a package that doesn't wear you out over a full day afield.

The Resolute line is built around CMMG's ZEROED ecosystem of matched components, meaning the muzzle brake, trigger, charging handle, safety, and grip all work together as an intentional system rather than a collection of random parts. The direct impingement action cycles reliably across the full spectrum of .22 ARC loads. Its 16.1-inch barrel—featuring a 1:7 twist and 4140CM SBN steel with an MT contour—was designed specifically for .22 ARC to stabilize bullets and deliver consistent velocity. The adjustable 0.750-inch gas block lets you fine-tune gas flow for your preferred ammo, suppressor use, or shooting conditions.

Build quality is serious: billet 6061-T6 aluminum upper and forged 7075-T6 aluminum lower receiver, both finished in durable Cerakote. The EML15 handguard strips unnecessary weight while keeping the M-LOK slots where they matter—at 3, 6, 9, and 12 o'clock—so you can mount optics, lights, or grips without excess rail. The RIPSTOCK adjustable stock, ambidextrous controls (charging handle, safety selector, sling plate), and ZEROED single-stage trigger make the gun equally at home for left or right-handed shooters. At 6.4 lbs and 32.5 inches overall with the stock extended, it's a genuinely handy rifle that doesn't sacrifice capability.

CMMG backs the Resolute with a no-nonsense design philosophy: every feature earns its place. This is a rifle for serious shooters—whether you're stretching shots at steel, hunting where .22 ARC makes sense, or simply exploring what a modern .22 platform can do.

Key Features

• .22 ARC caliber—delivers .22-250 level ballistics from an AR-15 platform
• 16.1-inch barrel with 1:7 twist optimized for .22 ARC performance
• Direct impingement operating system with adjustable 0.750-inch gas block for load flexibility
• Billet upper and forged lower receivers for precision fit and durability
• CMMG ZEROED matched component system: muzzle brake, trigger, charging handle, safety, grip, and trigger guard
• EML15 M-LOK handguard with slots at 3, 6, 9, and 12 o'clock—lightweight and modular
• Ambidextrous controls: charging handle, safety selector (60/90 degree), and sling plate
• RIPSTOCK adjustable stock for personalized length of pull
• Single-stage drop-in trigger
• Cerakote finish for weather resistance
• 6.4 lbs and 32.5 inches overall—compact and handy without sacrificing sight radius or handling

Specifications

Frequently Asked Questions

What is .22 ARC and why would I choose it?

.22 ARC is a next-generation .22 caliber cartridge designed specifically for the AR-15 platform. It delivers .22-250 level ballistics from a standard Mk4 receiver—giving you long-range performance and ballistic efficiency in a compact, modular package. It's ideal if you want precision rifle capability without the size and weight of a full-size gun, or if you're looking for a dedicated medium-range hunting or target rifle with lower recoil than larger calibers.

Can I use this rifle left-handed?

Yes. The Resolute 28A670Cmb features ambidextrous controls throughout: an ambi charging handle, a 60/90-degree ambidextrous safety selector, and an ambi sling plate on the RipStock. This makes it equally comfortable for right or left-handed shooters.

What magazines does this rifle use?

The Resolute 28A670Cmb comes with a CMMG 10-round magazine. Since .22 ARC is a specialized cartridge, you'll want to verify magazine compatibility with your ammunition before purchasing additional mags—CMMG offers purpose-built .22 ARC magazines.

Can I suppress this rifle or use a different muzzle device?

The muzzle is threaded 1/2 x 28, so suppressors and other muzzle devices in that pattern will fit. The adjustable 0.750-inch gas block allows you to tune gas flow if you move from unsuppressed to suppressed shooting, helping maintain reliable function across different loads.