CMMG Resolute MK4 Complete Upper Group 5.56mm 16.1″ AR-15 Black

Description

The CMMG Resolute MK4 complete upper group in 5.56mm NATO features a 16.1-inch barrel and matte black finish, offering a reliable drop-in upgrade for AR-15 builds. Built to mil-spec standards, it is ideal for home defense, tactical applications, and 3-gun competition.