CMMG ENDEAVOR MK4 .22 ARC 20 Stainless AR Rifle

The CMMG Endeavor MK4 in .22 ARC is a modern, modular rifle platform built for shooters seeking extended range capability and precision performance beyond standard intermediate cartridge platforms. Chambered in .22 ARC—a high-velocity, flat-shooting round designed for longer-distance accuracy—this 20-inch rifle leverages CMMG's proven MK4 AR15 architecture to deliver a versatile platform suitable for precision rifle work, varmint hunting, and specialized training applications.

The rifle features a 416 stainless steel barrel finished with Nitride coating, a process that enhances corrosion resistance and barrel longevity under sustained fire. The ZEROED muzzle brake manages recoil signature while the 15-inch EML handguard equipped with M-LOK attachment points at 12, 3, 6, and 9 o'clock positions supports accessory mounting without rail bloat, maximizing customization potential. A Magpul MOE rifle stock provides a standard cheekweld and proven ergonomics. At 11.4 pounds and 39.6 inches overall length, this rifle balances shootability with portability for field applications.

The .22 ARC cartridge delivers superior ballistic coefficients and velocity compared to 5.56 NATO from equivalent barrel lengths, making this platform ideal for precision work where wind drift and bullet drop are operational considerations. The Endeavor MK4's compatibility with standard AR15 components—triggers, grips, optic mounts—enables operators and enthusiasts to configure the rifle to specific mission requirements. This design approach ensures the rifle adapts to diverse use cases from target shooting to field precision work without requiring proprietary parts.