Optimize your handgun with Meprolight’s series of TRU-DOT Self-Illuminated Night-Sights. Test results by both entry-level and expert-level marksmen have shown an increase in hit efficiency by over 85% when using TRU-DOT sights, and are compliant with the exacting specifications of the US Military and NATO. These sights utilize the classic three dot configuration and are identical in appearance regardless of the lighting conditions. Features of the Meprolight TRU-DOT handgun sights. Tritium illumination Easy installation Seamless transition from day to night use Available in both fixed and adjustable Meprolight USA Meprolight S& W Front J-Frame 1 7/8 Barrel .151? Height 117603101