The CMMG Resolute Mk4 Upper in 5.56x45mm NATO is a high-quality assembly designed for any standard AR-platform lower. It features a 16.1 4140CM steel barrel with a 1:7 twist and a Salt Bath Nitride finish. The Armor Black Cerakote receiver is paired with a 15 EML15 M-LOK free-float handguard made from 7075-T6 aluminum. This unit comes fitted with an A2 Flash Hider on a 1/2x28 thread. Please note, this upper group does not include a BCG or charging handle, allowing for personalized component selection to complete your carbine build.