CMMG Resolute MK4 22 ARC 16.10" 15" M-LOK Complete Upper

The CMMG Resolute MK4 complete upper brings 22 ARC performance to the AR-15 platform, delivering ballistics comparable to the 22-250 Remington in a modern semi-automatic package. Chambered in the versatile 22 ARC cartridge, this upper is built for shooters looking to push the effective range of their AR-15 with flat trajectories and consistent accuracy.

At the core of this upper is a 16.10" barrel machined from 4140 steel with a 1:7 twist rate, optimized to stabilize a broad range of bullet weights for the 22 ARC. The upper receiver is forged from 7075-T6 aluminum, the duty-grade standard for AR-15 components, offering an excellent strength-to-weight ratio and long-term durability under hard use.

A 15" M-LOK handguard wraps the barrel, providing a full-length accessory mounting platform for lights, lasers, bipods, and other M-LOK-compatible accessories. The slim M-LOK design keeps the handguard lightweight while offering secure attachment points along its length.

This complete upper is designed to drop onto any mil-spec AR-15 lower receiver, making it a straightforward upgrade or build component for the Mk4 platform. Whether you are building a new rifle or refreshing an existing one, the CMMG Resolute MK4 22 ARC upper delivers the quality and performance CMMG is known for.