After a shooting session or a day of Hunting, and the gun has been fired, I clean it. And as the Scope has to come off the Bases (I use bases and rings that return the Scope to Zero) I ALWAYS CHECK THE SCREWS TO MAKE SURE THERE SNUG. As long as you check em your good. Usually if they do come loose it's after a (First-Time) mounting of a Scope as they wer'nt as tight as they should have been, so always check them after mounting a Scope for the first time. BP