DoubleD:

I have heard/read what you say before, but have never experienced it myself. I have several Rugers with stock factory rings and not had the problem. Thanks for the pix.

I will say this; I put a screwdriver to them occaisionally and none are on hard-kicking rifles.

I'm confused on something; A scope that remains under the same tension but experiences fatigue and failure of the mounting system can hardly shoot an accurate group as loosening of the part would be introduced. Or did you tighten the screw more to compensate for the faire and then shoot for group?

Similarly, I don't see how zero can shift but group size remain tight as a result of part failure {more or less same question as above} unless constant tightening is applied.