CMMG Resolute MK4 5.56 AR-15 Barreled Upper Receiver – Black – 16.1″

CMMG Resolute MK4 5.56 AR-15 Barreled Upper Receiver – Black – 16.1″

Upgrade your next AR-15 build with the CMMG Resolute MK4 5.56 Barreled Upper Receiver, designed for precision and durability. Featuring a 16.1″ Chrome Moly barrel with a medium contour and a 1:7 twist rate, this upper receiver delivers superior accuracy and handling. The 1/2×28 threaded muzzle is equipped with the CMMG ZEROED muzzle brake, which helps reduce recoil and improve follow-up shots.

The barrel, made from 4140 chrome-moly steel, is coated with a salt-bath nitride finish for corrosion resistance and longevity. The mid-length gas system ensures smoother operation and recoil management, making it a reliable choice for any shooting scenario.

The upper is machined from billet 6061-T6 aluminum with a durable black Cerakote finish, paired with the CMMG EML15 M-LOK handguard for added customization options. With a total weight of just 3.6 lbs and an overall length of 25 inches, this upper receiver provides excellent balance and maneuverability.

Features

• MK4 platform
• 5.56 NATO
• Direct impingement
• 16.1″ barrel length, MT contour
• 1:7 barrel twist
• 4140 CM barrel material, salt bath nitride finish
• CMMG ZEROED muzzle brake
• 1/2×28 muzzle thread
• Mid-Length gas system
• Billet 6061-T6 aluminum upper receiver
• CMMG EML15 M-LOK handguard
• Black Cerakote finish
• Weight: 3.6 lbs
• Overall length: 25″