The CMMG Resolute Mk3 in 8.6 Blackout (brand part no. 33A590C-AB) is a semi-auto rifle built on CMMG’s Mk3 platform, a DPMS-pattern .308/AR10-derived receiver chosen for wide parts availability. CMMG pairs the 16.1-inch black nitride barrel with a fast 1:3-inch twist tuned to stabilize 8.6 Blackout’s heavy, short-barrel-friendly projectiles. The rifle includes CMMG’s RIPSTOCK adjustable buttstock and the EML 15 M-LOK handguard, with a CMMG Zeroed 60/90-degree safety selector for a shorter, faster throw. Among big-bore AR platforms in the AR rifles category, the Resolute favors hunters who want strong suppressed performance from a shorter barrel.

Key Specifications

• Chambered in 8.6 Blackout, built for full ballistic potential from a short barrel.
• Barrel has a fast 1:3-inch rate of twist, tuned for 8.6 Blackout’s heavy bullets.
• Built on CMMG’s Mk3 platform, a DPMS-pattern .308/AR10-derived receiver.
• Features a 16.1-inch black nitride barrel.
• Includes the CMMG RIPSTOCK adjustable buttstock.
• Wrapped in the EML 15 M-LOK handguard.
• Fitted with a CMMG Zeroed 60/90-degree safety selector.
• Ships optics-ready with no fixed sights.
• Feeds from a detachable magazine with a 20-round capacity.
• Finished in Armor Black.

Frequently Asked Questions

Why is 8.6 Blackout suited to a shorter barrel? Its fast 1:3-inch twist and cartridge design reach full ballistic potential from a much shorter barrel than typical AR10-class cartridges.

Is this rifle suppressor-friendly? Yes, 8.6 Blackout is popular for suppressed hunting with subsonic ammunition.

What platform is this rifle built on? CMMG’s Mk3, a DPMS-pattern .308/AR10-derived receiver.

Buy the CMMG Resolute Mk3 8.6 Blackout

A short-barrel big-bore AR built for strong suppressed performance is exactly what the Resolute Mk3 delivers. Order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL.