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My aged eyes simply cannot focus on the PS90's factory BUIS. So, I had my 'smith install a rear red horizontal fiber optic bar and front green fiber optic dot on my new MagazineParts PS90 optics rails. Now all I need do is center the fuzzy green dot on top of the fuzzy red bar to be on target (I had the 'smith boresight the setup).
Tomac
ETA: See new fiber optic BUIS pic below.
Tomac
ETA: See new fiber optic BUIS pic below.