The CMMG Endeavor MK4 is a direct impingement semi-automatic rifle chambered in .22 ARC with a 20-inch barrel. The forged 7075 T-6 aluminum frame wears a Black Armor Cerakote finish, and the rifle ships at 7 lbs (6.8 lbs empty) with a 30+1 capacity. 
 

Key Specifications 

• Model: Endeavor MK4 
• Caliber: .22 ARC 
• Action: Direct Impingement Semi-Auto 
• Barrel Length: 20 inches 
• Overall Length: 37.8 inches 
• Capacity: 30+1 rounds 
• Weight: 7 lbs (6.8 lbs empty) 
• Frame Material: Forged 7075 T-6 Aluminum 
• Receiver Finish: Black Armor Cerakote 
• Trigger Type: Zeroed Drop-In Single Stage 
   

Detailed Features 

 
The adjustable Magpul stock fits a range of shooters and positions. The CMMG Zeroed Muzzle Brake reduces muzzle rise for faster follow-up shots. The integrated Picatinny rail handles optics and accessories cleanly, and the EML handguard with M-Lok compatibility lets you add lights or grips without the bulk of a full rail. The stainless steel barrel pairs with the aluminum receiver under the Cerakote finish for durability.

Owners of the CMMG Endeavor MK4 in .22 ARC generally report positive experiences, with a few common threads worth knowing.

Build quality draws consistent praise. The Cerakote finish holds up well and the overall construction is described as solid for the price range. At the range, most users report reliable cycling and good accuracy for both target work and small game.

The .22 ARC caliber is a recurring positive. Manageable recoil makes it accessible for newer shooters, and the running costs are lower than centerfire alternatives.

Customization options get favorable mention; the platform takes upgrades and accessories without much hassle.

On the other side, the price point is a common discussion point. Some feel it's high for a .22-caliber platform and compare it unfavorably to less expensive options. Customer service experiences with CMMG vary. Some owners report good support, others describe slow response times on warranty matters.