CMMG Resolute Mk4 6mm ARC 16.1" Rifle - Armor Black Finish

The CMMG Resolute Mk4 6mm ARC rifle bridges the gap between compact handling and extended-range capability in a way that full-size AR platforms can't match. Built on the proven AR-15 platform but chambered in 6mm ARC—a modern cartridge specifically engineered to deliver rifle-class ballistic performance from a shorter package—this 16.1" carbine is built for hunters and distance shooters who refuse to compromise. The Armor Black Cerakote finish and lightweight 6.4-pound build make the Resolute equally at home in tight timber stands or on open-country glassing missions.

CMMG equipped the Resolute Mk4 with a serious parts lineup under the ZEROED platform umbrella. The 416 stainless steel barrel wears a 1:7.5 twist optimized for 6mm ARC ammunition, backed by a CMMG ZEROED muzzle brake (5/8x24 thread) that helps manage recoil and follows aim. Up top, the billet upper and forged lower receiver deliver the precision fit shooters expect, while the EML15 M-LOK handguard keeps weight down without skimping on mounting real estate—you'll find M-LOK slots at 3, 6, 9, and 12 o'clock for lights, grips, and other essentials.

The trigger, safety selector, charging handle, and grip all wear the ZEROED stamp, meaning nothing here feels like a budget compromise. The RIPSTOCK carbine-length stock, ambidextrous controls, and included 10-round magazine round out a rifle that's genuinely configured for serious use. At just over 32 inches end-to-end, the Resolute Mk4 doesn't feel like a short gun—it shoots like a rifle—and the 6mm ARC cartridge's exceptional ballistics mean you're not trading velocity or wind-bucking for portability the way you would with a traditional 5.56 carbine.

If you've been torn between an oversized AR-10 and a duty-grade AR-15, the Resolute Mk4 in 6mm ARC solves the equation. It's built to go the distance without the distance-rifle burden.

Key Features

• 6mm ARC chambering delivers extended-range ballistic performance in a compact AR-15 platform
• 416 stainless steel barrel (1:7.5 twist) optimized for 6mm ARC ammunition
• Lightweight 6.4-pound carbine ready to move and hold steady
• CMMG ZEROED muzzle brake, trigger, charging handle, safety, and grip—quality standard throughout
• EML15 M-LOK handguard with slots at 3, 6, 9, and 12 o'clock for modern accessory mounting
• RIPSTOCK ambidextrous stock and receiver extension for comfortable shooting control
• Billet upper receiver and forged lower for precision fit and durability
• Armor Black Cerakote finish for low-reflection, durable appearance
• Includes 10-round magazine and ambidextrous charging handle

Specifications

Frequently Asked Questions

What is 6mm ARC and why choose it over standard 5.56?

6mm ARC (Advanced Rifle Cartridge) was designed to deliver exceptional ballistic performance in AR-15 platform rifles, rivaling the extended-range capability typically associated with larger AR-10 and .308 rifles. If you hunt or shoot at distance and want superior wind-bucking and velocity retention compared to 5.56 NATO, without stepping up to a full-size rifle, 6mm ARC bridges that gap effectively.

What comes included with the CMMG Resolute Mk4?

The rifle ships with one 10-round magazine and is fully assembled and ready to shoot. All controls—safety selector, charging handle, trigger, grip, and stock—are installed. You'll need to source ammunition, a scope or sighting system, and any additional magazines beyond the one included.

Is the Resolute Mk4 suitable for hunting, or is it range-only?

The Resolute Mk4 is built as a dual-purpose rifle. The 6mm ARC cartridge, compact 16.1" barrel, and lightweight 6.4-pound build make it well-suited for hunters seeking a portable, accurate rifle for extended-range work. The ZEROED parts quality and RIPSTOCK stock support serious field use. Pair it with appropriate optics and ammunition for your game, and it's ready for the field.

Can I add a suppressor or other muzzle devices to the Resolute Mk4?

Yes. The barrel features a 5/8x24 muzzle thread and ships with a CMMG ZEROED muzzle brake. This thread pitch is standard and accepts most 6mm suppressors and muzzle devices designed for that specification. You can swap devices as needed for your application.