HIVIZ H & K Compact Overmolded Fiber Optic Front Sight (Green) Heckler Koch USP Compact front sight Resin overmolded green front sight Fits HK USP Compact 45 ACP 357 Sig 40 SW and 9mm Height of sight is 6.2mm HiViz recommends gunsmith installation for all dovetail sights. Due to manufacturing tolerances, some firearms may require additional fitting.