For Winchester Model 70, 670, 770, and 70A Professionall installed and gently range used a couple of times. Mark 4® Tactical Bases are the only bases to accommodate both the oversized 8-40 screw and a 6-48 screw, providing compatibility with the widest range of modern tactical firearms. Only 6-48 screws included with these bases. Rugged steel construction. $60.00 shipped. Postal Money Orders or Bank Checks only. No trades needed. Thanks.