Product Summary
The CMMG Mk4 Resolute Upper Receiver Group is a high-quality 6.5mm Grendel upper designed to pair seamlessly with any standard AR-15 lower receiver. This complete upper features a 16.1-inch barrel finished in Armor Black and includes a CMMG Zeroed Muzzle Brake for improved recoil management. Built from durable Billet 6061 T6 Aluminum, it features an M-LOK rail system and a .750-inch gas block journal. It is an ideal choice for shooters looking to expand their collection with a reliable, ready-to-assemble rifle platform.
