CMMG ENDEAVOR MK4 .22 ARC 20 Stainless Rifle

The CMMG Endeavor MK4 in .22 ARC is a modern AR-15 platform rifle engineered for shooters who demand extended range capability without sacrificing modularity or reliability. Built on CMMG's proven MK4 AR-15 architecture, this rifle delivers the ballistic performance of a purpose-built intermediate cartridge in a package compatible with standard AR-15 components and accessories.

The rifle features a Nitride-finished 416 stainless steel barrel optimized for the .22 ARC cartridge, which delivers superior ballistic coefficients and velocity retention compared to smaller intermediate rounds. The 15-inch EML handguard with full M-LOK mounting at 12, 3, 6, and 9 o'clock positions enables rapid accessory integration for optics, lighting, and tactical hardware. A ZEROED muzzle brake manages recoil impulse and aids in target reacquisition during rapid fire sequences. The Magpul MOE rifle stock provides ergonomic cheek weld and proven controls familiar to AR platform operators.

This rifle suits precision-oriented shooters, hunters engaging medium to extended ranges, and operators seeking a .22 ARC platform that accepts a broad ecosystem of aftermarket AR-15 parts and upgrades. The 20-inch barrel length balances muzzle velocity with practical portability in field conditions, while the Endeavor MK4's modular design ensures users can customize furniture, charging handles, triggers, and other components without specialized tools or gunsmithing.

Weighing 7.8 pounds unloaded, the CMMG Endeavor MK4 .22 ARC rifle maintains a practical weight for field carry while the 39.6-inch overall length keeps the rifle manageable in vehicles and tactical environments. The .22 ARC cartridge itself represents a growing category within intermediate-power rifle development, offering shooters a distinct alternative to 5.56 NATO and 6.5 Grendel platforms.