CMMG's MkGs Barrel and BCG Kit allow you to build a Pistol Caliber Carbine using their Patent Pending Radial Delayed Blowback System. Unlike typical direct blowback systems, our RDB uses a bolt that is forced to rotate and unlock, slowing the BCG. This results in a lighter BCG for a lighter rifle, and less felt recoil than a straight blowback system. CMMG MkG Barrel and Bolt Kits are designed to work exclusively with their MkG Lowers, and a mil-spec upper receiver with enlarged ejection port. Other manufacturers' receivers may work, but CMMG cannot guarantee function or reliability. Barrels are 5a ^2 Medium Taper or 8" Medium Taper 1:10 Twist 414 Mfg: Cmmg
