CMMG Resolute Mk4 5.56mm AR-15 Rifle – 16.1" Nitride Barrel, FASTBACK Stock, Armor Black
The CMMG Resolute Mk4 delivers a full-size AR-15 platform that blends reliability with well-thought-out upgrades. Its nitride-treated 16.1-inch medium-contour barrel, proprietary FASTBACK telescoping stock, and ZEROED ambidextrous controls give shooters a modern, purpose-built rifle ready for range days or duty use right out of the box.
Condition
Overall Condition: Very good condition, showing only light, superficial signs of prior handling or use.
Bore Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent - Sharp lands and grooves.
Specific Condition Notes: This rifle shows only faint handling marks with no notable finish wear.
What’s Included
- CMMG Resolute Mk4 5.56mm rifle
- One 30-round Magpul PMAG polymer magazine
- Factory flip-up polymer front and rear sights
Built on CMMG’s Mk4 7075-T6 aluminum receivers, the Resolute uses a direct-impingement, rotating-bolt action with a nitride-finished bolt-carrier group for durability and smooth cycling.
The 16.1-inch 4140 chrome-moly steel barrel is nitride treated inside and out, threaded 1/2-28, and fitted with CMMG’s ZEROED two-port muzzle brake to control muzzle rise.
A 15-inch free-float M-LOK handguard offers 270-degree accessory coverage and an uninterrupted top Picatinny rail, giving ample real estate for optics, lights, and other accessories.
CMMG’s FASTBACK minimalist stock adjusts quickly for length of pull while keeping weight down, and the Armor Black finish on receivers, handguard, and stock provides a consistent, rugged look.
Ambidextrous controls, a Magpul MOE pistol grip, and standard magazine release round out a feature set designed for straightforward handling and user adaptability.