The CMMG Dissent MK4 is a direct-impingement rifle chambered in 6mm ARC with a 16.1-inch steel barrel finished in Black Armor Cerakote. The side-folding CMMG Dissent stock collapses the overall length down to 25.90 inches for transport, and extends to 36.60 inches for shooting. Total weight is 7.70 lbs. The aluminum receiver and steel barrel construction holds up under regular use, and the ambidextrous safety lever works for left- or right-handed shooters without reconfiguration. 
 

Key Specifications 

• Brand: CMMG 
• Model Name: Dissent MK4 
• Caliber: 6mm ARC 
• Barrel Length: 16.1 inches 
• Overall Length: Adjustable from 25.90 to 36.60 inches 
• Capacity: 10+1 rounds 
• Weight: 7.70 lbs 
• Operating System: Direct Impingement 
• Safety Mechanism: CMMG Zeroed 60/90 Degree 
• Trigger Type: Zeroed Drop-In Single Stage 
• Stock Type: CMMG Dissent Side Folding Stock 
• Grip Type: Standard Grip 
• Barrel Material/Finish: Steel with Black Armor Cerakote 
• Barrel Twist Rate: 1:7.50" 
   

Detailed Features 

 
The 1:7.50" twist stabilizes a range of 6mm ARC bullet weights without issue. The Zeroed Drop-In single-stage trigger has a clean break with minimal take-up. The side-folding stock locks solidly in both positions and doesn't shift under recoil when extended. 
 

Usage Scenarios 

• Home defense: Folded to 25.90 inches, the rifle stores tightly and clears hallways without the awkward length of a fixed-stock carbine. 
• Competitive shooting: 6mm ARC's retained velocity and BC advantage over 5.56 shows up at distances over 300 yards, where tight groupings matter in scored matches. 
• Hunting medium game: At practical field ranges, 6mm ARC provides adequate terminal performance on deer-sized animals.

Users split fairly predictably on the CMMG Dissent MK4 6mm ARC.

The folding stock is the most praised feature. People who need a compact rifle (for vehicle storage, range transport, or a small safe) find the 25.90-inch folded length genuinely useful rather than a gimmick. The 6mm ARC cartridge gets positive marks for its ballistic performance at distance, and the platform's compatibility with standard AR accessories makes building it out straightforward.

Build quality is consistently well-regarded. The CMMG construction reputation carries over here. Owners report the action feels solid and cycles reliably across ammo types.

On the critical side, price is the top complaint. Comparisons to cheaper ARs in 5.56 are common, and not everyone finds the 6mm ARC advantage worth the premium. Ammunition availability and cost also come up. 6mm ARC is less common than 5.56 or .308, which affects how easy it is to train with and stock up. A few users note the 7.70-lb weight is heavier than they expected from a compact folding platform.