CMMG Endeavor Mk3 | .308 Win | 20 in | 20rd

The CMMG Endeavor Mk3 is a semi-automatic AR10-platform rifle chambered in .308 Winchester and built for long-range performance and reliability. It features a 20-inch 416 stainless steel barrel with a nitride finish and components selected for accuracy and modularity. This configuration suits precision target work and hunting where extended-range capability and a balanced carry weight matter. A Vortex Viper PST Gen II 5-25×50 (commonly available for under $1,000) is a practical optic choice for pairing with this rifle.

Product Specifications

• The caliber is .308 / 7.62 NATO.
• The barrel measures 20 inches and is made from 416SS SBN.
• The muzzle is threaded 5/8 x 24 and fitted with a CMMG ZEROED muzzle brake.
• The action is Semi-Auto.
• The operating system is Direct Impingement.
• The barrel twist rate is 1:10.
• The handguard is a CMMG EML15 M-LOK design.
• The upper and lower receivers are 7075 T6 billet aluminum.
• The stock is a Magpul MOE Rifle Stock and the receiver extension is A1.
• The buffer type is Rifle Mk3/A1.
• The included magazine is a Magpul 20rd PMAG.
• The trigger is a ZEROED drop-in.
• The finish is Cerakote in Black and the color is listed as Black.
• The weight is 8.8 lbs and the overall length is 41.2 inches.
• The charging handle and pistol grip are CMMG ZEROED Ambi and CMMG ZEROED Pistol Grip, respectively.
• The UPC is 810144728834.

Thoughtfully configured for marksmen who value modularity and long-range capability, the Endeavor Mk3 pairs quality materials with practical features like M-LOK accessory mounting and a ZEROED muzzle brake. Its AR10-sized Mk3 platform provides room for upgrades and customization while retaining a balanced feel for field use and precision work. For shooters prioritizing accuracy at extended distances, this rifle offers a solid foundation for optics, stocks, and support gear.

Users commonly praise the Endeavor Mk3 for its long-range accuracy and balanced handling, and many reviewers note its modular construction and quality component selection.

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