The CMMG Resolute Mk4 Upper in 350 Legend is a specialized high-performance assembly for the AR-platform. It features a 16.1 barrel with a 1/2x28 thread pattern, optimized for straight-wall cartridge performance. The Armor Black Cerakote receiver is paired with a black M-LOK free-float handguard, providing a durable and modular mounting surface for accessories. Built on the Mk4 series, this upper is designed for seamless integration with any standard AR-style lower receiver, making it an ideal choice for hunters and shooters in restricted straight-wall states.