I bought a nice FN Mauser sporter by Firearms International and the previous owner had removed the open sights and lost them. I'm trying to find some replacements but can't find a front ramp that seems like it will fit. It used a single screw and the barrel diameter is only .575 at the screw. Most ramps I have found either use multiple screws or are for larger contour barrels. Any help besides "drill some more holes" would be greatly appreciated. Thanks!!