These make a great gun even better - AmeriGlo Smith Wesson Night Sight Sets, Pro Glo Front

I have night sights on all of my guns and had never tried "I-dot" sights before purchasing these for my M&P Shield. I'll start by saying I'm 58 years old and my eyesight is not what it was in my youth. In many cases I need some corrective vision in order to get a good sight picture now. These sights are bar none the best I've ever had for these old eyes. With the blacked out rear sight and the big bright front sight I can pick these up well with or without glasses. I'd read in the past that all black rear sights are preferred by many pros and now I know why. Without the two rear dots the eye naturally picks up the front sight with ease and without the disruption of trying to center the front dot between the two rear dots. For my sight acquisition is now faster and better than ever. And now for the night or low light experience. It is true that a view of three tritium-lit equal sized dots can slow down aiming, and there is the possibility at night and under extreme duress that an individual can actually line the dots up incorrectly, with the front dot outside the two back ones. With an I-dot system sight alignment is so instinctual and fast. One dot over the other and you are on target.

I'm sorry for the long review here, but I am really sold on these AmeriGlo sights. I intend to put them on all my guns they are available for.