it's not that the screws are getting loose, it's that the scope is slipping in the rings and the space between the rings is getting too much. It's like the mount is built to a looser standard and that allows the scope to be loose. The only way that I can get the scope to fit tight in the rings is too loosen the screws on the ring on the rear one while keeping the front tight, and then push them as far apart as possible and tighten the rear while pushing. That is good for one or two shots and then it is loose again. I dont want to shake my prostaff apart!