CMMG ENDEAVOR MK4 22 ARC 20″ | 28A7F0CMB

The CMMG Endeavor Mk4 in .22 ARC is a semi-automatic modern sporting rifle built for modularity and extended-range rimfire-style applications. It pairs a 20-inch barrel with an M-LOK handguard and Cerakote Midnight Bronze finish for corrosion resistance and a distinctive appearance. The platform accepts common AR-15 compatible components and is configured for optics and accessory mounting. For an optic under $1,000 that complements this rifle, consider the Vortex Viper PST Gen II 1-6×24 as a versatile option for both close and extended-range work.

Typical applications for this rifle include precision-oriented target shooting and varmint hunting where a flat-shooting .22 ARC load provides effective terminal performance at distance.

Product Specifications

• The UPC is 810148627140.
• The manufacturer part number is 28A7F0CMB.
• The model is listed as the Endeavor MK4 22 ARC.
• The caliber is .22 ARC.
• The action is Semi-Automatic.
• The barrel measures 20 inches.
• The overall length measures 39.8 inches.
• The weight is listed as 6.8 pounds.
• The rate of twist is 1:7″.
• The finish is Cerakote Midnight Bronze.
• The stock material is synthetic.
• The rifle uses a detachable magazine.
• The handguard is a CMMG EML15 M-LOK unit.
• The gas system is a .750″ rifle-length gas system.
• The muzzle is threaded 1/2-28″ for accessories.

The Endeavor Mk4 offers a modular AR-15 compatible platform with a long-for-caliber barrel and accessory-friendly handguard. Its Cerakote Midnight Bronze finish and M-LOK layout make it well suited to shooters who want a capable .22 ARC rifle for precision-oriented target work and varmint hunting, with room to fit optics, lights, and other accessories to match mission needs.

Owners and reviewers frequently note the rifle’s strong component compatibility with standard AR-15 parts and its attractive Cerakote Midnight Bronze finish.

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