CMMG Resolute MK4 6mm ARC 16.1" 10+1 Semi-Auto AR-15 Rifle

The CMMG Resolute MK4 is an AR-15-pattern semi-automatic rifle chambered in 6mm ARC, a modern cartridge purpose-built to deliver excellent long-range ballistic performance from a compact AR-15 platform. Built around a 16.1" medium-taper threaded barrel with a 1:7.50" twist rate and an aluminum receiver finished in Armor Black Cerakote, the Resolute MK4 ships with one CMMG 10-round magazine.

Up front, CMMG's ZEROED muzzle brake helps keep the platform flat during rapid fire, while the barrel's 5/8"x24 thread pattern accepts a suppressor or an alternate muzzle device of the shooter's choice. The medium-taper barrel profile strikes a balance between handling and accuracy for both close-quarters and mid-range applications. An M-LOK handguard with a full-length top Picatinny rail provides ample real estate for optics, lights, lasers, and other accessories, and ships without iron sights so the end user can configure their optic loadout from the start.

The operating controls come from CMMG's premium ZEROED line, including the ZEROED 60/90-degree safety selector, the ZEROED trigger guard, and a ZEROED drop-in single-stage trigger for a clean, predictable break. The rifle uses a direct-impingement action and feeds from a detachable magazine, in this case a 10-round CMMG magazine that brings the total capacity to 10+1.

The stock is CMMG's 6-position RipStock in Gray, providing tool-free length-of-pull adjustments to fit a wide range of body types and shooting positions. At 6.40 lbs unloaded and 32.50" overall, the Resolute MK4 is a manageable weight for a modern-cartridge AR-15 rifle. Made in the USA, the Resolute MK4 is built for shooters who want long-range AR-15 capability straight out of the box.

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