I have a ruger mkII stainless model that the scope mount rail keeps comming loose after you fire 20-30 rds thru it. I can tighten them up and it does it again. I have used nail polish and loctite on screws going into receivers before and had 1 problem getting the screw back out. Given the size of the screws it doesnt take much to have a problem. Anybody else have the same issues or use something else???