CMMG Endeavor MK4 22 ARC 20" AR-15 Complete Upper - Armor Black

The CMMG Endeavor MK4 complete upper brings long-range precision to the AR-15 platform, chambered in 22 ARC, a modern cartridge engineered to deliver 22-250 class ballistic performance from a lightweight semi-auto rifle. This configuration features a 20" barrel with a 1:7 twist rate, optimized for stable accuracy and consistent velocity out to extended distances.

Built with CMMG's signature fit and finish, the upper is coated in Armor Black Cerakote for corrosion resistance and long-term durability. A factory-installed M-LOK compatible handguard offers generous real estate for accessories, while the included ZEROED muzzle brake helps keep felt recoil and muzzle rise in check for quicker follow-up shots.

Shipped fully assembled, this complete upper comes with a matching bolt carrier group (BCG) and charging handle, ready to drop onto any compatible AR-15 lower. Manufactured by CMMG in the USA, the Endeavor MK4 is aimed at hunters, competitors, and recreational shooters looking to stretch the reach of their AR-15 platform.