The CMMG Dissent MK3 is an AR-pattern pistol chambered in 8.6 BLK with a 12.5-inch black nitride barrel. It has a 7075-T6 aluminum receiver, an 11-inch proprietary handguard, and ships with two Magpul 20-round magazines and a pistol brace. The finish is Armor Black. 
 

Key Specifications 

• Brand: CMMG 
• Model: Dissent MK3 
• Caliber: 8.6 BLK 
• Action: Semi Auto 
• Capacity: 20 rounds 
• Barrel Length: 12.5 inches 
• Color/Finish: Armor Black 
   

Detailed Features 

• 12.5-inch black nitride barrel 
• 7075-T6 aluminum receiver 
• 11-inch proprietary handguard 
• Two Magpul 20-round magazines included 
• CMMG Zeroed pistol grip 
• Pistol brace configuration

The CMMG Dissent MK3 in 8.6 BLK attracts owners who want a short-barreled AR platform optimized for suppressor use, as the 8.6 BLK cartridge is designed around subsonic loads. Owners consistently note the platform is purpose-built and that the proprietary handguard and Zeroed grip give it a distinct, intentional layout rather than a generic AR feel.

Reliability with the black nitride barrel and 7075-T6 receiver gets good marks from owners running the pistol regularly. The 12.5-inch barrel length is noted as a reasonable compromise, keeping the overall package manageable while supporting good velocity for both subsonic and supersonic 8.6 BLK loads. The Magpul magazines included in the package are well-regarded.

The Dissent MK3 is not a cheap option, and owners are split on whether the price delta over a standard AR pistol is justified unless you are committed to the 8.6 BLK caliber specifically. Those who are find it a focused, well-executed platform; those who aren't sometimes feel the proprietary elements limit parts flexibility.