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.