Elliason sight
My Series 70 Gold Cup has the same problem. Thought I was going blind, had to keep adjusting the sight. Adjustment screw was backing out with recoil, but never came out. Seems to me the little vertical pin must be pushed by a spring I can't see, into notches in the screw. Maybe the spring is gunked up or broken. I'll be glad to read what you gurus have to say about this.
cptmclark
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