I have always cleaned the tgreads very well, if stock screws are sloppy I replaced them with better quality screws. Add a small drip of blue loctite and wipe off the excess. Tightened just good and snug making sure there is no play... Let gun sit fir 24 hrs. It has been almost 2 years since I last set my stock screws and no loosening has occured!! Been doungbthat for almost 30 years and never an issue. Most folks dont clean the threads, or use sloppy fitting screws, or use to much loctite....these are the reasons their screws come loose.