The CMMG Resolute MK4 in .300 AAC Blackout is a direct-impingement AR-pattern rifle with a 16.1-inch barrel chambered for a cartridge that works well suppressed or unsuppressed. The Coyote Tan finish is applied to the receiver and handguard. 
 

Key Specifications 

• Caliber: .300 AAC Blackout 
• Barrel Length: 16.1 inches 
• Capacity: 30 rounds 
• Weight: 6.2 lbs 
• Overall Length: 32.5 inches 
• Condition: New in Box 
• Finish Color: Coyote Tan 
• Manufacturer: CMMG 
• Model Number: Resolute MK4 
   

Detailed Features 

The 4140 Chrome Moly Steel barrel has a Salt Bath Nitride finish for wear and corrosion resistance. The CMMG ZEROED muzzle brake reduces muzzle rise and speeds follow-up shots. The charging handle and safety selector are ambidextrous, which matters if you're left-handed or run the gun from unconventional positions. The Mk4 Forged Lower pairs with the CMMG RipStock, an adjustable stock that locks firmly at each position without play.

Feedback on the CMMG Resolute MK4 in .300 AAC BLK is mostly positive. Build quality is the most consistent praise — users say the fit and finish are tight and the coyote tan looks good in person. Accuracy and reliability across different ammunition types get mentioned often, which matters with .300 BLK since so many load variations exist.

The ergonomics get good marks. The adjustable stock and handguard geometry suit most shooters without modification. Modularity is a draw for people who like to swap optics or add accessories over time.

On the negative side: some find it slightly bulky compared to lighter AR builds, and the price draws scrutiny from buyers comparing it to budget options. Parts and accessory sourcing has come up as a minor concern for owners looking to modify or repair specific components.