My 760 in 30-06 wasn’t shooting very well, I took the scope off to shoot with the iron sights and discovered somebody modified the existing rear sight with a file. Took the whole “V” shape out of it and it’s just flat now. I’d like to get a new rear sight for the gun but I can’t find it available anywhere. Does anyone know if there are are aftermarket ones available that will fit? Mine is the dovetail version.