Dick, you can't tighten anything with that screwdriver! Its shank is both too long and too thin, and its handle too small. That thing looks like it is made to work on electronics, not a gun! Maybe a better one would let you get the screw tight enough to keep it from loosening up?

I usually follow about the same procedure you do. I think part of our job as "custodians" is to keep an eye on screws. I have been shooting a lot of years now and have only lost one - a thumbpiece nut, back when I was a teenager. Really damaged the pride. A lesson learned early, I guess.

Glad you had a good day at the range, and cooperative weather!