The CMMG Dissent MK4 is a semi-automatic pistol chambered in .300 AAC Blackout with a 10.5" barrel, 30+1 capacity, and optic-ready configuration. It weighs 4.8 lbs and runs on a direct impingement operating system. Receivers are 7075 T6 aluminum with Cerakote finish. 
 

Key Specifications 

• Brand: CMMG 
• Model: Dissent MK4 
• Caliber: .300 AAC Blackout 
• Barrel Length: 10.5 inches 
• Capacity: 30+1 rounds 
• Weight: 4.8 lbs 
• Action Type: Semi-Auto 
• Safety Mechanism: Lever safety 
• Grip Material: Black Polymer 
• Sights Type: Optic Ready 
   

Detailed Features 

The Triggertech AR-D two-stage trigger has a clean break and a positive reset, which helps with faster follow-up shots. An adjustable gas block lets users tune flow for different ammunition types or suppressor use, relevant for a .300 BLK platform where subsonic loads are common. The CMMG Zeroed Linear Compensator redirects muzzle blast forward, which matters in enclosed spaces. The 7075 T6 aluminum receivers are finished with Cerakote for corrosion resistance. The side-charging handle is present in the original design and operates without reaching over the top of the receiver.

Owners of the CMMG Dissent MK4 .300 BLK tend to focus on two things: the compact package and .300 Blackout's subsonic versatility. The 10.5" barrel works well suppressed, and users who shoot both subsonic and supersonic loads appreciate the adjustable gas block for switching between the two.

Build quality feedback is consistently positive. The receivers and finish hold up, and the rifle functions reliably across most ammunition types, though a few users note sensitivity to certain loads. The Triggertech trigger gets good marks for the break and reset. The optic-ready setup is appreciated by users who want to add glass without additional milling or adapter work.

Recoil management gets positive reviews for the caliber and barrel length combination. Price is a dividing point; some buyers find the value justified, others compare it unfavorably to competing platforms in the same caliber. Ergonomics are mostly well-received but controls placement gets occasional criticism. Reliability is generally high across the user base with some ammunition-specific caveats noted.