The CMMG Dissent MK4 is an AR-pattern semi-automatic pistol chambered in 338 ARC with a 10.5-inch barrel and 10+1 capacity. The finish is black. The pistol configuration keeps overall length compact while retaining the AR-platform manual of arms. 
 

Key Specifications 

• Brand: CMMG 
• Model: Dissent MK4 
• Caliber: 338 ARC 
• Action: Semi Auto 
• Capacity: 10+1 
• Barrel Length: 10.5 inches 
• Color/Finish: Black 
   

Detailed Features 

• 10.5-inch barrel 
• 338 ARC chambering 
• 10+1 capacity 
• AR-pattern pistol configuration 
• Black finish

Owners of the Dissent MK4 in 338 ARC occupy a specific niche: buyers who want an AR-pattern pistol chambered in something harder-hitting than standard AR offerings without stepping up to a larger platform. The 338 ARC is viewed as a meaningful step up in terminal performance, and the CMMG pistol layout is appreciated for its compact form factor.

The 10.5-inch barrel generates predictable debate around muzzle blast and concussion. Most buyers who chose this configuration accept the trade-off for a shorter overall package, though owners who shoot it unsuppressed at indoor ranges consistently describe it as demanding. CMMG build quality on the Dissent line gets generally favorable reviews, with most criticism focused on magazine and ammunition availability for 338 ARC.

Value relative to alternative AR pistols is the dominant discussion point. The 338 ARC commands a price premium over common AR configurations, and buyers who prioritize the cartridge performance consider it justified. Feedback from those running suppressors on the 10.5-inch barrel is largely positive, though the initial suppressor setup process draws the usual learning curve comments.