CMMG Resolute MK4 60B1091-AB, Upper Receiver, 6MM ARC, 16.1 in Barrel, Cerakote Finish, Armor Black 60B1091-AB

Overview

The CMMG Resolute MK4 is a complete upper receiver group chambered in 6mm ARC, designed to pair with standard AR-15 pattern lower receivers. Featuring a 16.1-inch 416SS SBN medium contour barrel with a 1:7.5 twist and a 5/8x24 threaded muzzle equipped with a CMMG ZEROED muzzle brake, this platform delivers extended-range accuracy and efficient ballistic performance. Built upon a billet 6061-T6 aluminum upper receiver and a CMMG EML15 M-LOK handguard, it features a Cerakote Armor Black finish. The direct impingement system includes a rifle-length gas port and a non-adjustable 0.750 gas block. This upper group comes complete with a bolt carrier group and CMMG ZEROED accessories, including an ambi charging handle and a polymer dust cover.

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