CMMG Dissent MK4 6mm ARC 16.1" Armored Black Rifle - 60AA90C-AB

The CMMG Dissent MK4 6mm ARC is a compact, modern sporting rifle built for hunters and long-range shooters who want serious ballistic performance in a package that doesn't weigh you down. 6mm ARC delivers the downrange authority of .243 Winchester or .308 Winchester from an AR-15 platform rifle—no need to step up to a heavier AR-10. The Dissent takes the familiar AR manual of arms and adds a forward-charging handle, side-folding stock, and precision-tuned components that make it equally at home at the range or in the field. This isn't a budget build; it's a purpose-built platform for shooters who value accuracy and ergonomics.

What sets the Dissent apart is its thoughtful spec sheet. The side-folding stock with adjustable length of pull and cheek riser lets you dial in your fit, while the 16.1-inch stainless barrel (1:7.5 twist) is optimized for 6mm ARC ballistics. The gas block is adjustable—critical for tuning performance with different ammunition. The free-floating M-LOK handguard with integrated top Picatinny rail gives you clean mounting options for optics, lights, or other gear. The forward non-reciprocating charging handle keeps you on target without the distraction of a side charging handle that moves, and the CMMG ZEROED muzzle brake helps manage recoil while you're making precision shots.

All the controls—safety, trigger guard, and pistol grip—are CMMG ZEROED components, part of a cohesive design philosophy. Two 10-round magazines are included, and the whole setup weighs 6.7 pounds unfolded (25.9 inches folded). This is a rifle that rewards you for learning its details, whether you're hunting mid-range game, competing at distance, or simply chasing tighter groups than you thought possible from an AR-15-sized platform.

Key Features

• Compact 6mm ARC caliber delivers long-range performance on an AR-15-pattern platform
• Adjustable side-folding stock with cheek riser for personalized fit and portability
• Forward non-reciprocating charging handle for shooter-friendly manipulation
• Adjustable gas block for ammo-specific tuning and reliability
• M-LOK handguard with integrated top Picatinny rail for accessory mounting flexibility
• CMMG ZEROED muzzle brake, trigger, safety, and controls throughout
• 16.1-inch stainless barrel with 1:7.5 twist optimized for 6mm ARC
• Includes two 10-round magazines
• Lightweight at 6.7 pounds for field mobility

Specifications

Frequently Asked Questions

What makes 6mm ARC different from .308 or .243?

6mm ARC is designed to deliver rifle-caliber ballistics and stopping power in an AR-15-sized platform without the added weight and recoil of larger AR-10 guns. You get flatter shooting characteristics and the ability to reach out to distance, but in a carbine that's easier to carry and quicker to handle than a full-size .308.

Can I use AR-15 magazines and parts with the Dissent MK4?

The Dissent MK4 uses CMMG's proprietary magazine design—two 10-round magazines are included with the rifle. While the platform shares the AR-15 manual of arms and familiar controls, the Dissent is a distinct platform with its own component ecosystem, so not all AR-15 parts will interchange.

Is the gas block adjustable, and why does that matter?

Yes, the gas block is adjustable. This allows you to tune the rifle's gas flow for reliable function with different ammunition loads and weights, which is especially useful when working up loads for 6mm ARC or switching between factory and handloads. Proper tuning can improve reliability, control recoil, and extend component life.

What's included in the box?

The Dissent MK4 comes with two 10-round magazines. Optics, ammunition, and other accessories are sold separately.