The CMMG Dissent Mk4 .300 Blackout rifle pairs a 16.1-inch barrel with a bufferless side-folding stock, so it carries like a compact carbine and stows short when you need it to (brand part no. 30A750AMB). This one wears a Midnight Bronze Cerakote finish and comes with two Magpul 30-round PMAG magazines. A ZEROED SVB brake sits on the 5/8×24 muzzle threads, and an adjustable gas block lets you tune the action for supersonic or subsonic loads. A forward non-reciprocating side charger and an M-LOK handguard with a top Picatinny rail keep the controls and accessory mounting within easy reach. It suits a suppressed home-defense carbine as readily as a dedicated .300 Blackout range gun.

Key Specifications

• The chambering is .300 Blackout, a cartridge with subsonic and supersonic loads for self-defense, hunting and target shooting.
• Barrel length is 16.1 inches, a carbine-length tube that keeps the rifle compact without leaving performance behind.
• The rifling twist is 1:7, a fast rate that suits the heavier bullets this caliber is known for.
• A ZEROED SVB muzzle brake is installed from the factory, helping tame recoil and muzzle rise.
• Muzzle threads are 5/8×24, the standard pitch for mounting a suppressor or swapping muzzle devices.
• The gas system uses an adjustable 0.750-inch gas block, so you can dial it in for subsonic or supersonic ammunition.
• The DISSENT side-folding stock offers adjustable length of pull and an adjustable cheek riser for a custom fit.
• The handguard is a 15-inch proprietary M-LOK design with a top Picatinny rail, giving plenty of room for lights, grips and optics.
• The trigger is a ZEROED drop-in unit, a CMMG fire control design that installs as a single assembly.
• Overall length is 33.3 to 35.5 inches with the stock open and 25.9 inches folded, with a weight of 6.4 pounds.

Frequently Asked Questions

How short is it with the stock folded? The rifle measures 33.3 to 35.5 inches with the stock extended, depending on length of pull, and 25.9 inches folded. It weighs 6.4 pounds.

What magazines come with it? It comes with two Magpul 30-round PMAG magazines made for .300 Blackout.

Can I shoot it suppressed? The muzzle is threaded 5/8×24 beneath the ZEROED SVB brake, and the adjustable gas block lets you tune the gas system for supersonic or subsonic loads, which is how CMMG describes using this rifle with a suppressor.

Buy the CMMG Dissent Mk4 Rifle, .300 Blackout, 16.1-Inch, Midnight Bronze, Muzzle Brake, 30-Round

Midnight Bronze Cerakote, a folding stock and a tunable gas system make this one of the more distinctive ways to run an AR-pattern .300 Blackout. Order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL, and browse more AR rifles while you are here.