AmeriGlo I-Dot, Sight, Fits Glock 42 and 43, Green Tritium Lime Green LumiLime Outline Front with Green Rear GL-305 Utilizing a dot-over-dot configuration" their i-Dot sets have an extended square-notch rear for increased sight radius with a glare-reducing undercut rear face. The i-Dot sights provide a quick and easy vertical sight alignment" making it an excellent choice for all shooters.