CMMG Resolute MK4 Complete Upper Group – 22LR 16.1″ Black

Upgrade your AR-15 platform with the CMMG Resolute MK4 Complete Upper Group in 22LR. Chambered in .22 LR and featuring a 16.1-inch barrel in a clean matte black finish, this complete upper group is engineered for reliable rimfire performance on an AR-style platform. Built by CMMG — one of the most trusted names in American-made AR components — the Resolute MK4 upper delivers the ergonomics and modularity shooters expect from a full-size AR, combined with the economical and fun shooting experience of the .22 LR cartridge. Whether you’re training, plinking, or building a dedicated rimfire rifle, this complete upper group is a straightforward drop-in solution for MIL-SPEC lower receivers. Ideal for competitive shooters, new shooters looking to build skills with reduced recoil and lower ammunition costs, and enthusiasts who want a versatile addition to their collection. Shop online at Deep Roots Rifle Co for fast shipping nationwide, or visit our gun store in Eustis, Florida to speak with our knowledgeable staff about this upper and compatible lower options.