The 22 short, 22 long, and 22 long rifle all have the same rim, base, and neck diameter on the case (this is known as a straight case). 357 Magnum stainless revolver holds six rounds. Where is serial number on Ruger Police Service Six?Ī letter “U” is stamped to the right of the serial number located on the bottom of the grip frame. 4 How to get serial number for Ruger Blackhawk?.

3 How to find the serial number of a Ruger rifle?.