Sharps Bros MB74 7.62x39mm AR Lower, Black - SBAK04

The MB74 receiver is patterned after the original milled Bulgarian receivers, but with the added feature of an integrated AR buffer extension Each 2 lb receiver is machined from a solid 15 lb block of US sourced 4140 steel, then heat treated to an RC41 hardness The MB74 receiver is designed to accept 22mm press-in barrels, and is compatible with any stamped or milled AK-74 parts kit (some fitting required) The barrel journal is cut to 0.866 inches diameter after heat treat The target interference between the barrel and barrel journal is 0.001 inches, the absolute maximum interference would be 0.0015 inches It is important to measure your barrel to ensure that it will fit the MB74 receiver ;