i cant remember what the cross over is i think they are the same that are on the rifles... go on rugers site at the acssessorys and look at the part number for them and the rifles.. see what one is the match and go from ther.. redfield and burris and leupold both make them for it at all most the same cost.. you might be better off looken around on the different forums once you find out what set they match...
Dave