CMMG Endeavor MK4 22 ARC 20" 10+1 Semi-Auto Rifle - Armor Black

The CMMG Endeavor MK4 is a semi-automatic rifle built on CMMG's proven Mk4 AR-15 platform and chambered in the high-performance 22 ARC (Advanced Rifle Cartridge), delivering 22-250 Remington-class ballistics from a modular AR-platform package.

This configuration features a 20" barrel machined from 416 stainless steel with a protective nitride finish, paired with a 1:7 twist rate optimized to stabilize a wide range of 22 ARC bullet weights. The barrel is threaded and ships with a muzzle brake installed, giving shooters an easy path to a suppressor or alternate muzzle device down the road.

The rifle is fed by a 10-round detachable magazine and finished throughout in CMMG's signature Armor Black Cerakote, offering corrosion resistance and a subdued, tactical look. An EML handguard provides M-LOK compatible accessory mounting, and the rifle stretches to approximately 39.5" in overall length. As a standard AR-15-pattern firearm, the Endeavor MK4 accepts a wide range of readily available AR-15 furniture, magazines, and accessories.

DISCLAIMER: Firearms and receivers are subject to state-specific shipping restrictions and must be transferred through a valid FFL dealer. Please visit our shipping restrictions page to review all applicable restrictions for your state. Subject to change.