Unrelated to the OP's question, the 5" 686-6+ that I sold was a 1/2 lug and was shipped
with Ahrens Wood Cocobolo grips, a Hi-Viz orange dot front sight, V-notch rear sight,
target hammer and a smooth target trigger.
I think these Stocking Dealer Exclusives were the only 1/2 lug 686s.