Tactical Solutions Pac-Lite Standard Picatinny Sight Rail BE AWARE that that the Pac-Lite uses same hole spacing as RugerBUTThey use a 6-40 screw NOT a 6-48 screw like RugerPac-Lite = 6-40Ruger = 6-48(for those that do not know the 40 and 48 are how many...