CMMG Mk4/AR15 Upper Receiver Assembly Midnight Bronze

CMMG MK4 Upper Receiver Features The CMMG MK4 Upper Receiver Assembly starts from a billet 6061 T6 aluminum upper machined for a tighter more uniform fit than typical forged receivers while retaining full compatibility with the MK4 and AR15 platform. Its 14.5 inch steel barrel is cut with a 1:7 inch twist rate a rate that stabilizes a broad range of 5.56 NATO and .223 Rem bullet weights from lighter varmint loads up to heavier match projectiles. The steel barrel construction provides the durability needed for sustained use while keeping the upper s overall weight manageable on a complete build. Chambered for 5.56 NATO and .223 Rem this upper gives shooters flexibility in ammunition selection without sacrificing reliability. Finished in Midnight Bronze Cerakote the upper brings a distinctive durable coating that resists wear while giving a build a coordinated upgraded appearance. CMMG designed this assembly as a drop-in upper option for builders assembling or upgrading an MK4 pattern AR-15 lower simplifying the path to a complete rifle. The billet receiver s clean lines and finish make it a strong foundation for a dedicated range or duty build. Builders looking to combine a quality barrel a refined billet upper and a standout finish will find this CMMG assembly a solid base for their next project. CMMG MK4 Upper Receiver Specifications Manufacturer: CMMG Model: MK4 Upper Receiver Caliber: 5.56 / .223 Rem Barrel Length: 14.5 Barrel Material: Steel Twist Rate: 1:7 Receiver Material: Billet 6061 T6 Aluminum Color: Midnight Bronze Available At: ARMSAGORA