CMMG Resolute MK4 5.56x45mm NATO 16.1" M-LOK Free-Float Upper - Armor Black (No BCG/Charging Handle)

The CMMG Resolute MK4 is a complete AR-platform upper receiver group chambered in 5.56x45mm NATO, built around a 16.10" barrel and finished in a uniform Armor Black coating. Designed as a turn-key upper assembly for the Mk4/AR-15 platform, the Resolute pairs CMMG's free-float handguard with a precision barrel to give builders a ready-to-mount option for completing a custom rifle or upgrading an existing lower.

The handguard is CMMG's M-LOK free-float design, providing a rigid, accurate platform with M-LOK slots along its length for accessories while allowing the barrel to float free of contact for consistent shot-to-shot performance. The barrel falls within CMMG's 16" to 16.99" length range, balancing maneuverability with the velocity and energy expected from a 5.56 NATO chambering. The Armor Black finish is applied across both the upper receiver and the free-float handguard for a matching, low-glare appearance suited to duty, training, and recreational applications.

As supplied by the manufacturer, this upper ships without a bolt carrier group (BCG) or charging handle, allowing builders to pair it with their preferred components. When mated with a compatible AR-15/Mk4 lower receiver and a BCG of your choice, the Resolute MK4 upper forms the foundation of a versatile semi-automatic rifle.