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Old 09-19-2017, 10:04 AM
denpython denpython is offline
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from wikipedia

maybe yours is a transition model. No pinned barrel but retained the recessed cylinder. Anyway if the previous owner was firing only .357 magnum, I would physically check the cylinder to barrel gap,end shake, and check the underside of the top strap for burn.

"Model 66

66 (1970): Stamping of each model.
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 Uncle Mike's 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): Introduced internal lock.
66-7 (?): Two piece barrel and internal lock,
(2005): Discontinued.
66-8 (2014): Reintroduced with 4.25" barrel in 2014 and later with a 2.75" barrel in 2017."
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