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 Smith & Wesson M&P compact, fullsize, and Shield and Shield Plus in all calibers, does not fit optic ready models, 9EZ or EZ 380.