The CMMG Dissent MK4 is a semi-automatic carbine chambered in 5.56x45mm NATO with a 16.1-inch barrel and a side-folding stock. Forged aluminum receivers and a Cerakote finish cover the exterior. The folding stock collapses the overall length from 37 inches to 27.60 inches, which is the main practical differentiator from a standard AR-pattern carbine. 
 

Key Specifications 

• Model Name: Dissent MK4 
• Caliber: 5.56x45mm NATO 
• Action: Semi-Automatic 
• Capacity: 30+1 rounds 
• Barrel Length: 16.1 inches 
• Overall Length: Adjustable from 27.60" to 37" 
• Weight: 6.70 lbs 
• Barrel Twist Rate: 1:7" 
• Finish: Cerakote 
   

Detailed Features 

 
The CMMG Zeroed muzzle brake reduces felt recoil and lets you get back on target faster between shots. An adjustable gas block accommodates different ammunition loads and suppressor use. The Zeroed drop-in single-stage trigger has a short reset and a clean pull. The 1:7" twist is suited to heavier 5.56 projectiles and 77-grain loads common in defensive and precision configurations. 
 

Target Audience 

 
Shooters who want an AR-platform carbine in a more packable format. The folding stock is the primary draw. It makes the rifle practical for vehicle storage, backpacks, or confined storage without moving to a short-barreled configuration. 
 

Usage Scenarios 

• Home defense where storage space is a constraint and quick deployment matters 
• Range shooting where the AR platform's parts compatibility and aftermarket ecosystem are advantages 
• Competitive carbine matches where the adjustable length of pull suits different gear setups

The CMMG Dissent MK4 in 5.56 NATO gets a generally positive reception, with the folding stock drawing the most attention in reviews.

The compact folded length is the most-cited reason buyers chose this over a standard AR carbine. Owners who store firearms in vehicles or limited spaces consistently report that the folding mechanism works as described and holds zero reliably when unfolded. Build quality is described as solid, with the forged receivers and Cerakote finish holding up to regular range use without issues.

Accuracy and reliability feedback is positive for a standard 5.56 carbine. Most users shoot factory ammunition without feeding problems, and the adjustable gas block provides flexibility for suppressor users who need to tune port pressure.

Ergonomics are generally well-received, with the grip and controls described as comfortable and reachable without awkward hand positioning. The Zeroed trigger gets specific mention for a clean break compared to mil-spec alternatives.

Weight at 6.70 lbs is discussed in both directions. Most find it manageable for extended sessions; a smaller group wish it were lighter, particularly for carry-heavy use cases.

Price falls above standard AR carbines, and buyers weigh the cost against the folding stock feature and CMMG's build quality. Those who prioritize packability consider it worthwhile; those who don't need the folding stock often note that similar performance is available for less from conventional AR builders.