Excellent sites. don't believe the negative reviews online - Meprolight FT Bullseye Tritium Self-Illuminated Rear Pistol Night Sight

Excellent sights for those who love iron sights but are iffy about red dots. Sight acquisition and accuracy is the same. In fact, it took only 2 range trips to get accustomed to the sights. I originally bought it for my Kahr CW9 because the factory front sight kept flying out. I liked it so much I purchased it for my M&P Shield plus. The Meprolight bullseye are very bright as long as you have ambient light in the room. However, in pitch dark the sights are not as bright as a traditional night sight. However, you should always be identifying your target in the dark before you shoot anyways! Highly recommend!