Description

Upgrade your AR-platform with the CMMG 5.7x28mm Threaded Barrel Kit. Featuring a 16.1-inch barrel and bolt carrier group, this kit uses the Radial Delayed Blowback system for reduced recoil and lighter weight. Compatible with Mk4/mil-spec AR15 uppers, it pairs seamlessly with CMMG Mk57 or Mk4/AR15 mil-spec lowers. Finished in sleek black, this kit includes a last round bolt hold open feature, perfect for a reliable carbine-length AR build in the versatile 5.7x28mm caliber.