HiViz HRB1001 - Ruger Mark II / III and Ruger Single Six.
Fits Mark II and III heavy barrel guns including 22/45 and Browning Buck Mark Pistols (except Challenge, 5.5 Target, and 5.5 Field).
Fits the Ruger Single Six with adjustable rear sights. NOTE: The screw provided in the package will be slightly longer than needed for the Single Six. A few threads can easily be filed off to assure a proper fit.
Package includes six interchangealbe LitePipes in red and green in various diameters, carrying case for pipes and key to interchange them.