The CMMG Endeavor MK4 is an AR-15 pattern semi-automatic rifle chambered in .22 ARC with a 20-inch threaded barrel. It ships with a Magpul stock and Charcoal Green Cerakote finish on the receiver. Capacity is 30+1 rounds. 
 

Key Specifications 

• Brand: CMMG 
• Model: Endeavor MK4 
• Caliber: .22 ARC 
• Action: Semi Auto 
• Capacity: 30+1 
• Barrel Length: 20 inches 
• Color/Finish: Charcoal Green Cerakote 
   

Detailed Features 

• 20-inch threaded barrel 
• Charcoal Green Cerakote finish 
• Magpul stock included 
• AR-15 platform chambered in .22 ARC 
• 30+1 round capacity

Owners of the CMMG Endeavor MK4 in .22 ARC tend to praise the fit and finish, particularly the Charcoal Green Cerakote which holds up well in varied conditions. The 20-inch barrel draws consistent positive comments for delivering good velocity from the ARC cartridge, though some buyers note the overall rifle length can feel unwieldy in confined spaces.

Ergonomics get a favorable reception, with the Magpul stock drawing particular appreciation for its adjustability. The MK4 platform feels familiar to anyone with AR experience, though a handful of owners mention the .22 ARC magazine selection is narrower than standard AR calibers.

Value discussion is mixed. Buyers who prioritize the ARC cartridge and want a longer barrel option see the Endeavor as a logical pick. Those comparing price-per-feature to comparable AR builds sometimes feel the premium is steep, but build quality complaints are rare.