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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.
66 - no dash - introduced 1970.
66-1 - 1977, changed the gas ring from the yoke to the cylinder.
66-2 - 1982, eliminated pinned and recessed, slightly lengthened cylinder.
66-3 - 1986, new yoke retention system / radius stud package / hammer nose bushing / floating hand
66-4 - 1994, change rear sight leaf, drill and tap frame, introduce Hogue grips, change extractor.
66-5 - 1998, change in frame design: eliminate cylinder stop stud/eliminate serrated tangs/change to MIM hammer with floating firing pin/change internal lockwork.
66-6 - 2002, introduce internal lock.
2005 - discontinued.
2014 - reintroduced.