Just a note to anyone who wears the Transition type of automatic dimming lenses in their glasses; the Trijicon Reflex sight is NOT compatible with these lenses. I was trying one of these sights out when I discovered this. Everything was fine as long as I was in the shade, but when I stepped out into the sun and my glasses dimmed a bit, the sight picture completely disappeared. There was a red dot on a completely blank screen! I don't know why this problem exists, and Trijicon is not forthcoming with an answer to my communication to them about it, but I wanted to let folks with auto-dimming lenses know to TRY a Reflex in the sunlight before they buy one. NOT a polarization issue; I removed the polarizing filter from the Reflex and it made no difference - and my glasses are not polarized either.