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aperture

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    Advanced Marksmanship Sterling Shooter, or other aperture sight gurus?

    Have a Palma rig outfitted with a Warner #2 rear and a Gehmann #566 iris. How the heck do you keep the iris from unscrewing where it's threaded to the rear sight when you change the iris adjustments? I wanted to adjust the aperture -- the range being 0.5 to 3.0 -- and when I turned it to the...