The CMMG DISSENT MK4 is an AR-pattern .350 Legend build using direct impingement operation and the familiar AR15 manual of arms. It combines a 16.1-inch barrel with a 1/2x28 muzzle thread and the included CMMG ZEROED muzzle brake, along with a rail-forward handguard for optics and accessories. The finish is Cerakote in a blue and black color scheme, and the rifle-cartridge build feeds from a magazine that carries 10+1 rounds. 
 

Key Specifications 

• Brand: CMMG 
• Model: DISSENT MK4 
• Caliber: .350 Legend 
• Barrel Length: 16.1 in 
• Color: Blue/Black 
• Finish: Cerakote 
• Capacity: 10+1 
   

Detailed Features 

• Direct impingement operating system with AR-15 pattern controls 
• 1:16 twist barrel tuned for .350 Legend performance 
• 1/2x28 muzzle threads with the included CMMG ZEROED muzzle brake 
• Rail-forward handguard built for optics and accessory mounting 
• Selector-controlled manual safety in the standard AR-15 location

The DISSENT MK4 draws attention mainly because .350 Legend gives shooters a straight-wall option on the AR-pattern platform for states that require it. Owners generally find the direct impingement system runs as reliably as other CMMG AR builds, though some note that straight-wall cartridges can be pickier about magazine and ammo combinations than 5.56 or .223.

Handling comments focus on the muzzle brake, which owners say noticeably tames recoil for a rifle-cartridge build, though a few find it louder at the muzzle in exchange. The rail-forward handguard gets praise for how much room it leaves for lights, optics, and other accessories without feeling front-heavy.

Because it shares the standard AR-15 manual of arms, owners already familiar with AR-pattern guns pick it up quickly, and the standard buffer tube and trigger group make it straightforward to swap parts. Some buyers wish CMMG offered more takedown pin and stock options directly from the factory.