The CMMG Dissent BR4 is an AR-pattern semi-automatic rifle chambered in 5.56 NATO with a 16.1-inch Black Nitride barrel. It has a 7075-T6 aluminum receiver and a 13.5-inch proprietary handguard, and ships with a Magpul SGA stock and a 10-round magazine. The finish is Black Nitride on the barrel with a standard black receiver. 
 

Key Specifications 

• Brand: CMMG 
• Model: Dissent BR4 
• Caliber: 5.56x45mm NATO 
• Action: Semi Auto 
• Capacity: 10+1 rounds 
• Barrel Length: 16.1 inches 
• Color/Finish: Black Nitride 
   

Detailed Features 

• 16.1-inch barrel with Black Nitride treatment 
• 7075-T6 aluminum receiver construction 
• 13.5-inch proprietary handguard 
• Magpul SGA stock included 
• Ships with 10-round magazine

The Dissent BR4 attracts buyers who want a rifle-length CMMG platform in 5.56 without going to a pistol or SBR configuration. The 16.1-inch barrel hits the legal minimum for a rifle and owners report good reliability with standard brass and steel-cased ammunition. The Magpul SGA stock is a reasonable choice, though some swap it early for a standard AR-style stock depending on preference.

The 13.5-inch proprietary handguard is a recurring point of discussion. It gives a clean look and adequate rail space, but owners who want to run specific aftermarket accessories find the non-standard mounting system limiting. The Black Nitride barrel finish gets positive marks for durability.

At its price point, the Dissent BR4 competes with upper-tier AR builds. Buyers who prioritize CMMG's fit and finish are generally satisfied, but those comparing it strictly on cost-per-feature find the proprietary handguard a drawback. The 10-round magazine capacity reflects state-compliance configurations, and buyers in standard-capacity states typically upgrade immediately.