The Ruger Mark 1 uses a 9 round magazine. Each unit of such ammunition measures 5.6 millimeters by 15 millimeters and is the most widely sold kind of ammunition in the world. 1 Caliber List and Production Data, Bradford O’Connor and The Jack O’Connor Heritage Center, First Introduction of the Ruger No.1 Single Shot Rifle, Five Editions of the Clayton Ruger No. Please Note: The Letter of Authenticity lists the serial number, ship date, model and caliber.
Do not insert spaces between any character in your serial number. 227 … Ruger - Mark II, Stainless Competition Target Model.
