I'd try a little penetrating fluid in the magazine tube threads. You'd have to remove the forearm to get to them.
Winner winner, chicken dinner. Removed forend (partially), penetrating oil on the threads for two hours and she twisted right out. Taking it down from that point on was easy. Soaking bore overnight in Wipeout....strong rifling, but a rather dark bore in my initial opinion.
Thanks guys for your help. Much appreciated.
