If you are talking about the scope mount screw, it's an easy fix. Take the rifle apart, remove the bolt. Clean the stripped hole good with brake cleaner or other de-greaser. Clean the screw the same way. Cover the screw with paste wax and fill the hole with JB Weld. After it sets for about 4-5 hours you can remove the screw. Let it completely cure and you're good to go. I've done this hundreds of times on old motorcycles that folks have abused and it always works and lasts as well as the new threads