Tru-Dot offers a handgun sighting system for improved rapid instinctive aiming which requires no transition from day to night use. Day and night, the shooters aiming reference is three solid dots, identical in appearance and location under all light conditions. Designed as replacement parts for the standard weapon sights, Meprolight's Self-Illuminated night sights can be mounted directly with minor modifications. Always ready, no switches or batteries. Maintenance free.