HIVIZ FASTDOT H3 is a unique low profile single dot sight system that combines both fiber optic and tritium for 24 hour illumination. Red fiber optic front sight, green tritium rear sight. 12 year Tritium warranty. Fits: S&W M&P compact, fullsize, and Shield and Shield Plus in all calibers. Does not fit optic ready models, 9EZ or EZ 380, EZ 30 Super Carry. Factory sight height.