Success!
Thank you to Ricklin for recommending KROIL as a penetrating oil, it worked like a charm. After 5 minutes to let it penetrate a firm twist rotated the barrel assembly and I had separated parts in my hands. After some cleaning to remove some very old and stiff oil the shotgun assembles and breaks down like it was intended to.
KROIL is more expensive than other more common penetrating oils but this one use has paid for the entire can.
Thanks for the help.
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