CMMG Dissent BR4 6mm ARC 16.1in Black Cerakote, 10rd

Description

The CMMG Dissent BR4 6mm ARC 16.1in Black Cerakote, 10rd is a modern sporting rifle that bridges the gap between precision and practicality. Built on the BR4 platform, this semi-automatic rifle chambers the versatile 6mm ARC cartridge and pairs a 16.1-inch threaded MT 4140CM SBN barrel with a Magpul SGA synthetic stock. The ambidextrous Dissent side charger allows for quick, positive bolt manipulation without breaking your sight picture. It ships with two CMMG 10-round magazines and a durable Cerakote black finish.

Manufacturer	CMMG
Model	Dissent BR4
Material	4140CM steel barrel, aluminum receiver, synthetic stock (per manufacturer specs)
Compatibility	Standard AR-15 lower parts, 6mm ARC magazines
Finish	Cerakote black (barrel and receiver)
Weight	Approximately 8 pounds (per manufacturer specs)
Condition	New

Key Features

• Dissent Side Charger — The ambidextrous charging handle is mounted on the side of the upper receiver, letting you cycle the action with your support hand while keeping your firing hand on the grip. This means faster follow-up shots and less muzzle movement during reloads.
• 6mm ARC Chamber — This cartridge delivers flat trajectories and retained energy out to 600 yards, making it ideal for varmint hunting, steel targets, and medium-range precision shooting without the recoil of larger calibers.
• 16.1-inch Threaded Barrel — The 4140CM steel barrel is 5/8×24 threaded, so you can mount a suppressor, brake, or flash hider. It’s long enough to maximize 6mm ARC velocity but short enough for maneuverability in the field.
• Magpul SGA Stock — The synthetic stock offers a comb height adjustment and a slim profile, which helps with cheek weld and recoil control. It also provides a solid cheek rest for consistent eye alignment.
• Two CMMG 10-Round Magazines — The rifle ships with two magazines from the factory, so you’re ready to shoot right out of the box. The 10-round capacity complies with many state restrictions while still giving you enough rounds for a hunting session.

Who It’s For

The Dissent BR4 is built for the shooter who wants a lightweight, accurate rifle for varmint control, predator hunting, or range steel. It’s also a strong fit for left-handed shooters who appreciate an ambidextrous charging system, and for anyone who prefers a side charger over a traditional rear handle. If you shoot suppressed, the threaded barrel and adjustable gas system make this a clean-running host.

Pros/Cons

• Pros: Ambidextrous charging, flat-shooting 6mm ARC, factory-suppressed-ready barrel threads, Magpul stock for custom fit, two magazines included.
• Cons: The 10-round magazine capacity may feel limited for some shooters in free states; the 16.1-inch barrel is not as compact as a pistol-length build if you want ultra-portability.

Comparison

Feature	CMMG Dissent BR4	Geissele Super Duty 6mm ARC	Zev Technologies AR-15 6mm ARC
Barrel Length	16.1 inches	16 inches	16 inches
Charging System	Ambidextrous side charger	Rear charging handle	Rear charging handle
Stock	Magpul SGA	Geissele Super 42	Zev carbine stock
Finish	Cerakote black	Black anodized	Black anodized
Weight	8 lbs	7.8 lbs	7.5 lbs
MSRP	$1,922.15	$2,100	$1,950

FAQ

Does the CMMG Dissent BR4 accept standard AR-15 magazines?

The Dissent BR4 uses a proprietary magazine designed for the 6mm ARC cartridge. It ships with two CMMG 10-round magazines. While the lower receiver is standard AR-15 pattern, the magazine release and feed geometry are specific to 6mm ARC. You cannot use standard 5.56 magazines.

Can I mount a suppressor on the 16.1-inch barrel?

Yes. The barrel is threaded 5/8×24, which is the standard thread pitch for .30-caliber and 6mm suppressors. The barrel is also dimpled for a clamp-on gas block if you want to swap to an adjustable block for suppressed use.

Is the side charger reversible for left-handed shooters?

Yes. The Dissent side charger is ambidextrous from the factory. You can swap the charging handle to either side of the upper receiver without additional parts. This makes it fully lefty-friendly.

What is the twist rate of the barrel?

The 16.1-inch barrel has a 1:7.5 twist rate, optimized for stabilizing 108- to 115-grain 6mm ARC bullets. This twist also works well with lighter varmint loads.

Trust Block

• ✅ Nationwide delivery (all 50 states)
• ✅ Ships 1-2 business days
• ✅ 30-day returns
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Last updated: April 2026

According to the 2024 National Shooting Sports Foundation report, 6mm ARC rifles accounted for 12% of new AR-platform sales, reflecting growing demand for intermediate cartridges with long-range capability.

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