The CMMG Dissent MK3 is an AR-pattern semi-automatic rifle chambered in .308 Win with a 12.5-inch barrel and a 20-round capacity. It ships in an Armor Black finish and is configured with a pistol brace. The 12.5-inch barrel is a short-barreled configuration; transfer requires additional federal paperwork. 
 

Key Specifications 

• Brand: CMMG 
• Model: Dissent MK3 
• Caliber: .308 Win 
• Action: Semi Auto 
• Capacity: 20 rounds 
• Barrel Length: 12.5 inches 
• Color/Finish: Armor Black 
   

Detailed Features 

• AR-pattern platform in .308 Win 
• 12.5-inch barrel in a braced configuration 
• 20-round capacity 
• Armor Black finish 
• Short-barreled configuration requiring additional federal transfer paperwork

Owners of the CMMG Dissent MK3 in .308 Win appreciate the platform's compactness relative to a full-length .308 AR. The 12.5-inch barrel makes the package noticeably shorter than standard carbine-length builds, which is the primary draw for those who want a maneuverable large-caliber platform.

The MK3 designation and .308 Win chambering mean this is a heavier, heftier build than .223 AR patterns, and some owners note that recoil management at this barrel length requires attention to muzzle device selection. CMMG's build quality generally receives positive marks, and the Dissent series has a reputation for fit and finish above the budget AR tier.

The Armor Black finish is a practical choice that wears well in field conditions. The main point of debate among owners is the trade-off: the short barrel sacrifices velocity compared to a longer .308 platform, and those who prioritize ballistic performance at distance tend to prefer a full-length barrel. For close-range and intermediate work, the Dissent MK3 has a clear niche.