Well, I don't have any of the items you have listed but I do have a really nice S&W 686 with a 6 inch barrel. It has been well maintained and is in great shape.
It's more than likely a 5" as measured from the front of the cylinder to the end of the barrel. I have one just like it and do not recall a 29 Classic ever being offered in a 4" full-underlug configuration.
I sent you a PM yesterday.
WFR
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