The CMMG Resolute Mk4 Upper in .22 ARC offers 22-250 ballistic performance for the AR-15 platform. It features a 16.10 4140 Chrome Moly steel barrel with a 1:7 twist and Salt Bath Nitride finish. The Midnight Bronze Cerakote assembly includes a 15 EML15 M-LOK handguard machined from 7075-T6 aluminum. This complete upper comes equipped with a bolt carrier group, CMMG ZEROED Ambidextrous Charging Handle, and ZEROED Muzzle Brake on a 1/2x28 thread. A drop-in trigger is specified for the build, ensuring consistent and repeatable function. Midnight Bronze finish