I have used the Troy (normal aperture) and YHM backup flippysights. They both work fine, although I do like having an elevation adjustment on the rear sight. Adjusting the front sight for elevation isn't a big deal, it's just a personal preference.
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"A human being is primarily a bag for putting food into; the other functions and faculties may be more godlike, but in point of time they come afterwards."
-George Orwell
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