The R10 has seen a lot of use, Stan. It is, what, 30 years older than the Browning? I use 1 1/4 oz in it when I need it, late season pheasants in the cold, for example, but, no waterfowling.
I am the third owner I know of, and like all Rs that have seen a bunch of use, the action has slicked up and cycles like it has been greased with butter. It takes a lot of use for that to happen, the first owner doesn't usually get to see it.
You won't find Darnes for sale that are off the face, Stan. It doesn't happen, regardless of use. The problems most often seen involve people who have access to tools, who, really shouldn't.
Good luck with the repairs on the Browning.

Best,
Ted