The CMMG Resolute Mk4 Upper is a premium AR-style component chambered in .300 Blackout with a 16.10 barrel. Finished in Armor Black Cerakote, it features a free-float M-LOK handguard for easy accessory mounting and a 5/8x24 thread pattern for muzzle devices. This upper group is designed to fit any standard AR-platform lower receiver. Please note, this specific model is supplied without a bolt carrier group or charging handle, making it an ideal choice for custom builds.