The CMMG Resolute MK4 is an AR-pattern semi-automatic rifle chambered in 338 ARC with a 16.1-inch black nitride threaded barrel. The aluminum receiver has a Tungsten Cerakote finish and sits on a Picatinny rail upper with an M-LOK handguard. Capacity is 10+1 rounds. 
 

Key Specifications 

• Brand: CMMG 
• Model: Resolute MK4 
• Caliber: 338 ARC 
• Action: Semi Auto 
• Capacity: 10+1 
• Barrel Length: 16.1 in 
• Color/Finish: Tungsten Cerakote 
   

Detailed Features 

• 16.1-inch black nitride threaded barrel 
• Tungsten Cerakote aluminum receiver with Picatinny rail 
• M-LOK handguard 
• CMMG Ripstock adjustable stock in Tungsten polymer 
• CMMG Zeroed Grip

Owners of the CMMG Resolute MK4 in 338 ARC tend to focus conversation on the caliber itself. The 338 ARC in an AR-platform configuration is seen as a practical step up in terminal performance over the more common AR chamberings, and the 16.1-inch threaded barrel is appreciated for suppressor compatibility.

The Tungsten Cerakote finish gets consistently positive feedback for appearance and scratch resistance. The CMMG Ripstock and Zeroed Grip combination receives decent marks for comfort, though some shooters swap the grip for personal preference. The M-LOK handguard is treated as a practical baseline rather than a highlight.

The main friction point owners raise is magazine availability and cost for 338 ARC compared to more common chamberings. Build quality is regarded as solid for the price, and the threaded barrel is seen as a meaningful inclusion rather than an afterthought.