HIVIZ interchangeable front sight for Ruger mark I, II, III and IV steel Bull barrel pistols. Also fits: Ruger 22/45 with adjustable rear sight (does not fit the 22/45 Lite); Ruger single-six revolvers with adjustable rear sight; Browning Buck mark pistols (does not fit the challenge, 5.5 target, and 5.5 field). includes six LitePipes in green, Red and white. Specifications: - Category: gun sights - type: sight - Material: steel - color: black - firearm type: MKII/mkiii and Buckmark - fiber optic color: green/Red