Apparently S&W fired my new revolver three times at the factory, because
it didn't bother to clean out those chambers or the forcing cone or the
crud the rounds tossed around. I looked at three of the other 686s the
dealer got in, and they were just as dirty.
So, the first step will be to clean everything, get the petrol-based
lube off with alcohol, and coat the works with FireClean.