CMMG Resolute MK4 5.56 NATO 16.1" AR-15 Complete Upper Group - Black

The CMMG Resolute MK4 Complete Upper Group drops onto any standard AR-15 lower to deliver a feature-rich 5.56x45mm NATO carbine built around a 16.1" Chrome Moly barrel. The upper receiver is machined from billet 6061 T6 aluminum with a black finish, giving the platform the strength and rigidity expected from CMMG's Mk4 lineup.

Featuring a 1:7 twist rate and a 1/2x28 threaded muzzle, the Resolute MK4 stabilizes a wide range of bullet weights and accepts virtually any standard AR-15 muzzle device or suppressor. The barrel is paired with a properly sized gas system built around a .750 in gas block journal for reliable cycling.

An M-LOK compatible handguard wraps the barrel, allowing you to mount accessories such as lights, lasers, bipods, and forward grips. This complete upper group is ready to pair with the AR-15 lower group of your choice for a custom build or as a replacement upper for an existing rifle.

Note: BCG and charging handle are not included and must be purchased separately.