The CMMG Endeavor Mk3 in .308 Winchester (brand part no. 38AB70C-AB) is a semi-automatic AR-10-pattern rifle built around a 20-inch, 5/8×24-threaded barrel, giving shooters extended-range accuracy in a proven battle-rifle cartridge. CMMG builds the Endeavor line on its Mk3 large-frame platform, and the rifle feeds from a detachable 20-round magazine and is finished in black. Among AR-platform rifles in the AR rifles category, the Endeavor Mk3 favors shooters who want a full-size semi-automatic .308 for long-range work.

Key Specifications

• Chambered in .308 Win/7.62 NATO.
• Operates as a semi-automatic AR-10-pattern rifle.
• Built on CMMG’s Mk3 platform.
• Features a 20-inch barrel.
• Muzzle is threaded 5/8×24.
• Feeds from a detachable magazine with a 20-round capacity.
• Finished in black.
• Ships at approximately 12.5 pounds shipping weight.
• Receivers are Mk3 billet 7075-T6 aluminum for a large-frame AR-10-pattern platform.

Frequently Asked Questions

Is the muzzle threaded? Yes, the 20-inch barrel is threaded 5/8×24 for a brake or suppressor.

What platform is this rifle built on? CMMG’s Mk3 large-frame AR-10-pattern platform.

Buy the CMMG Endeavor Mk3 .308 Win

A full-size semi-automatic .308 rifle built for long-range work is exactly what the Endeavor Mk3 delivers. As soon as it’s ready to ship, order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL.