All I can say is "wow, in all my life I have never seen a POS glow in the dark". These sights are inferior in every way to most any other sight on th market. And loosing almost an inch of sight radius (compared to trijicon hd) is just retarded. They could of easily moved the rear sight back to gain an extra half inch. Not to mention they can only be seen in direct sun light, and pitch black. It's a cool novelty, but has no place on a defensive handgun. You have been warned.