Cmmg Dissent Mk3 308Win 16.1 Armor Black

The CMMG Dissent Mk3 308Win is a .308 Winchester rifle built on CMMG's larger-frame Mk3 platform, engineered for shooters who demand a compact, versatile setup without compromising on power or control. With its 16.1-inch barrel and side-folding stock, this is the kind of rifle that works whether you're running drills on the range, hunting mid-sized game, or setting up in tight spaces where a full-length rifle becomes a liability. The Dissent Mk3 brings CMMG's modular design philosophy to the intermediate-distance game, pairing a proven action with smart ergonomics and user-serviceable components.

The barrel is 4140CM steel with a nitride finish—a tough, corrosion-resistant treatment that holds up to regular shooting and variable conditions without the brittleness some coatings can introduce. That nitride finish over 4140 steel is a practical choice for a working rifle: it handles recoil well, resists fouling, and won't leave you second-guessing your finish in the field. The 1:10 twist rate is standard for .308, stable across the range of bullet weights most hunters and precision shooters rely on. The action is direct impingement—the classic, proven system CMMG has refined across countless builds—paired here with an adjustable 0.750 gas block so you can tune the rifle to your load, suppressor, or ammunition without guesswork.

Ergonomics matter on a rifle you'll actually use, and the Dissent Mk3 doesn't cut corners. The side-charging handle is reversible, so it works lefty or righty. The stock folds to the side, dropping the overall length from 37.6 inches down to 28.2 folded—genuinely useful when you're working in a vehicle, tight blind, or confined space. The receiver extension is the proprietary DISSENT folding adapter, and the lower is billet 7075 T6 aluminum, which means no forging compromise and tight tolerances that stay tight. You get a ZEROED single-stage trigger (clean and predictable), an integrated trigger guard, and a 60/90-degree safety selector that won't snag your hand. Two Magpul 20-round PMAG LR/SR magazines come in the box. At 8.5 pounds, it's light enough to carry but substantial enough to shoot well.

The 15-inch CMMG proprietary handguard is topped with Cerakote finish, the upper and lower are 7075 T6 aluminum, and the whole gun is finished in Armor Black. The muzzle is threaded 5/8 x 24 with a CMMG ZEROED muzzle brake installed, so you can suppress it or swap the brake for your brake of choice.

Key Features

• .308 Winchester caliber on the Mk3 larger-frame platform
• 16.1-inch 4140CM barrel with nitride finish for corrosion resistance and durability
• 1:10 barrel twist optimized for standard .308 ammunition
• Direct impingement action with adjustable 0.750 gas block for tuning
• Side-charging, reversible charging handle for ambidextrous operation
• Side-folding stock adapter—folds to 28.2 inches for compact storage and transport
• ZEROED single-stage trigger and 60/90-degree safety selector
• Billet 7075 T6 aluminum upper and lower receivers for precision and durability
• 15-inch proprietary CMMG handguard with Cerakote finish
• 5/8 x 24 threaded muzzle with CMMG ZEROED muzzle brake (suppressor-ready)
• Integrated trigger guard and CMMG ZEROED pistol grip
• Includes two Magpul 20-round PMAG LR/SR magazines
• Overall weight: 8.5 lbs; length 34.6–37.6 inches (28.2 folded)

Specifications

Frequently Asked Questions

Is the Dissent Mk3 .308 suppressor-ready?

Yes. The muzzle is threaded 5/8 x 24, the standard thread pitch for .308 suppressors. A CMMG ZEROED muzzle brake is installed; you can swap it out for a suppressor or threaded adapter that matches your setup.

Can a left-handed shooter use this rifle?

Yes. The charging handle is reversible and can be positioned for either shoulder, making it ambidextrous. The safety selector is a standard 60/90-degree design. For a fully southpaw build, you would want to verify lower receiver compatibility with your preferred ejection-side setup, but the charging handle reversibility covers the main control point.

What magazines come with the rifle?

Two Magpul PMAG LR/SR 20-round magazines are included in the box.

How compact is the folded stock?

With the side-folding stock fully collapsed, the rifle measures 28.2 inches overall length, compared to 37.6 inches with the stock extended. This makes it much easier to store in a bag, vehicle, or confined space without removing the stock entirely.

What gas block adjustment options does the Dissent Mk3 have?

The rifle comes with an adjustable 0.750 gas block, which allows you to tune the action to your specific ammunition, barrel length, and whether you're running it suppressed or unsuppressed. This helps control cycle rate and recoil impulse.