I think 'adjustable sights' = Super Single Six. Creatividad En La Empresa Mauro Rodriguez Estrada Pdf Files there. Super Single-Six Revolver (Manufactured from 1964 to 1972) Caliber:.22 LR Beginning Serial Number: Years of Production: 5 5 5 5 5 5 60- 60- 60.

Ruger Single-Six with 9.5-inch Barrel Type Place of origin United States Production history Designer Designed 1953 Manufacturer Sturm, Ruger Unit cost $534 -754 () Produced 1953 - present Specifications Weight 32-40 Length 10¼ - 15 inches length 4⅝, 5½, 6½, 7½, 9½ inches,,, Barrels 6- Feed system 6-round Sights Fixed or adjustable (the Hunter model has provisions for mounting a ) The Ruger Single-Six is a single action produced. The Single-Six was first released in June 1953. The Single-Six is currently produced as the New Model Single-Six. The term 'New Model' simply means that this model includes Ruger's transfer bar mechanism for increased safety, allowing one to carry the revolver safely with all 6 chambers loaded. Prior to 1973, the Single-Six was produced without the transfer bar mechanism, making it less safe to carry with all six chambers loaded, and with the hammer resting on a loaded chamber. The allows the revolver to fire only when the trigger has been pulled.