<Tr> <Th> Sights </Th> <Td> Fixed or adjustable iron sights (the Hunter model has provisions for mounting a scope) </Td> </Tr> <P> The Ruger Single - Six is a single action rimfire revolver produced by Sturm, Ruger . The Single - Six was first released in June 1953 . </P> <P> 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 transfer bar safety allows the revolver to fire only when the trigger has been pulled . Ruger provides the transfer bar safety upgrade free of charge for owners of any old model Single - Six . </P> <P> The New Model Single - Six is currently chambered in . 22 LR, . 22 WMR (. 22 Magnum), and . 17 HMR (initially offered with a second cylinder in . 17 HM2). Barrel lengths include 45⁄8, 51⁄2, 61⁄2, 71⁄2, and 91⁄2 inches, available in both blued and stainless steel . </P>

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