The CMMG Resolute MK3 is an AR-pattern rifle chambered in 8.6 BLK with a 16.1-inch black nitride barrel. It has a 7075-T6 aluminum receiver and a 15-inch M-LOK handguard. The rifle ships with a 20-round magazine and the CMMG RipStock, finished in Armor Black. 
 

Key Specifications 

• Brand: CMMG 
• Model: Resolute MK3 
• Caliber: 8.6 BLK 
• Action: Semi Auto 
• Capacity: 20 rounds 
• Barrel Length: 16.1 inches 
• Color/Finish: Armor Black 
   

Detailed Features 

• 16.1-inch black nitride barrel 
• 7075-T6 aluminum receiver 
• 15-inch M-LOK handguard 
• CMMG RipStock 
• CMMG Zeroed grip 
• 20-round magazine included

Owners of the CMMG Resolute MK3 in 8.6 BLK typically choose it as a full rifle configuration for the caliber, taking advantage of the 16.1-inch barrel to extract better velocity from both supersonic and subsonic loads compared to shorter pistol variants. The 15-inch M-LOK handguard is frequently cited as a practical choice for accessories without adding unnecessary bulk.

The build quality, particularly the black nitride barrel and 7075-T6 aluminum receiver, gets consistent positive feedback. The RipStock is a point of discussion among owners, with some appreciating the locking positions and others preferring a more conventional collapsible stock. The Zeroed grip tends to divide opinion on ergonomics, as it is a CMMG-specific design rather than a standard AR grip angle.

The Resolute MK3 sits in a premium price tier, and most owners accept that given the caliber specificity and machining quality. Those who use it suppressed with subsonic 8.6 BLK loads are consistently satisfied; owners who primarily run supersonic ammunition sometimes question whether the platform's cost is justified over a standard .308 or .300 BLK AR.