I have acquired a Remington 511p minus the peep sight. The price of a used peep sight is twice what I payed for the rifle. So I was going to mount a scope on the 3/8 dovetail groves on the receiver. The problem is the top of the receiver is rounded and the rings I've tried are flat on the bottom and wont clear the rounded top of the receiver . If I drill and tap, buy mounts and rings I might as well buy the peep sight. I would like to find some rings that have the clearance for the receiver, at a reasonable price.(read cheap) Any suggestions ??