HIVIZ Smith & Wesson Front Fiber Optic Family Gun Sight, Green Fits: Smith & Wesson K, L, and n frame revolver Material: steel Color: green Smith and Wesson front revolver sight Pinned model Resin overmolded Green LitePipe Fits Smith and Wesson models 317 with 3 inch barrel 66 67 686 696 625 657 629 (except classic series and Performance Center guns) HiViz recommends gunsmith installation for all dovetail sights. Due to manufacturing tolerances, some firearms may require additional fitting.