Sharps Bros MB47 Stripped Lower Receiver Features The Sharps Bros MB47 stripped lower receiver is machined from a solid 15-pound block of 4140 steel down to a finished weight of just 1.8 pounds then heat treated to an RC41 hardness for durability under hard use. The barrel journal is reamed to .9065 post heat treat with a target interference fit between the barrel and journal of .001 inch ensuring a precise repeatable fit when building out the rifle. This receiver is compatible with any milled AKM parts kit as well as standard stamped AKM parts kits giving builders flexibility in sourcing components. A black oxide finish protects the steel from corrosion while keeping the classic appearance of the original milled Bulgarian pattern. What sets this receiver apart is its integrated 1913 Picatinny stock interface a feature not found on traditional milled AK receivers. That interface opens the door to modern folding stock options from manufacturers like Sig Sauer and SB Tactical letting builders modernize the furniture on an otherwise classic AK platform. Builders should note that minimal fitting of the top cover and safety may be needed when using a stamped receiver parts kit. For AK enthusiasts looking to build a rugged American-machined 7.62 X 39 rifle with modern stock compatibility the Sharps Bros MB47 is a strong foundation available for sale at GrabAGun. Sharps Bros MB47 Stripped Lower Receiver Specifications Manufacturer: Sharps Bros Model: MB47 Type: Stripped Lower Receiver Action: Semi-Automatic Caliber: 7.62 X 39 Color: Black Finish: Black Oxide Material: 4140 Steel Weight: 1.8 lbs Available At: GrabAGun