Smith & Wesson Sight Windage Nut, Rear

FITS: 41, .22; 4006, .40 S&W; 4506, .45 ACP; 5903, 9mm; 5904, 9mm; 5906, 9mm; 34, .22; 36, .38; 60-4, .38, .357; 63, .22; 631/631 LS, .32 Mag; 14, .38; 15-4, .38; 16, .32 Mag; 17-4, .22; 18-4, .22; 19, .357; 66, .357; 67, .38; 617, .22; 648