Rear Base for: Browning A-Bolt (European model), Mod 52, and 52C; Colt Sharps; Ruger No.1, and No.3; Sako 72, 75, and 78; Winchester 520. Front Base for: Browning A-Bolt (European model), Mod 52, and 52C; Parker-Hale 2600; Colt Sharps; Sako 72, 75, and 78; Winchester 520. Note: For the Browning A-Bolt (European Model), and the Mod 52 and 52C the front base screws must be shortened by grinding. For the Ruger No.1 and No.3 shimming will probably be required for perfect scope alignment. The front base may require modification for a correct fit. The gun will have to be drilled and tapped.
