I'd say you have damaged threads or a non-original barrel. I'm guessing that somebody down the line knew this, probably doing it themselves, and used Loctite or Super Glue on it just to tighten it up to sell. Your solvent/penetrating lubricants attacked the glue, so now the barrel is loose. Take it to a gunsmith experienced in Lugers. Maybe he can chase the threads and make it work. Above all, do not fire this gun.
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