Thin front sight with imbedded tritium. Meprolight combat proven self-illuminated night sights enable you to hit stationary or moving targets under low-light conditions with dramatically increased hit probability. Meprolight TRU-DOT models offer 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.