Introduced in 1972, the model 66 was a K-framed six shot .357 Magnum revolver. It is a stainless steel version of the Model 19 and was initially available with a 4" and 6" barrel. In 1974 a version with a 2 1/2" barrel and round grips was offered. It comes with a red/orange insert front sight and a white outline rear adjustable sight. The double action trigger on this revolver is extremely smooth. It fires .38, or .357 Magnum ammunition.