Sturm, Ruger & Co. Model: Single-Six Caliber: .22 Long Rifle (2 cylinders) & 22 WMR (1 Magnum Cylinder) Action: Single Action Revolver Capacity: 6 rounds Barrel Length: 6.5 inches Finish: Blued Frame: Steel Grips: Smooth walnut with Ruger medallions Sights: Fixed front blade, notch rear Country of Manufacture: United States Year of Manufacture: 1956 Serial Number: 375900