Hi-Viz FASTDOT H3, For Glock MOS 9/40, Tritium/Fiber Optic Night Sights, Red Front With Green Rear GGLMFD21 HIVIZ FASTDOT H3 is a unique low profile single dot sight system that combines both fiber optic and tritium for 24 hour illumination. Featuring a red front sight" green rear sight with a 12 year Tritium warranty. For all Glock MOS pistols in 9mm" 40 S&W" and .357 Sig.