I am not quite sure where this Single Six fits in? I traded into it today and here is the info on it. Frame is marked .22 cal. over Single-Six. No Inc. on Barrel, 1/16 inch serial number 3746XX. Both cylinders scratched with last 3 digits, alloy ejector rod housing, 6 1/2 inch barrel and XR3-Red grip frame. I came with non Ruger stag grip panels and is easy 98% revolver. I am thrilled to have it. Sort of curious where it fits . Because RENE lists it in a group Magnums per the serial number. In the type three paragraph. Any help and comments are appreciated.