One final thought. Perhaps the plunger (disconnect) in the front of the sear bar is stuck or binding so that it doesn't move back under the transfer lever when the trigger is released. That condition won't show up when you try the cannon off the frame trick.
Fortunately the striker is moving freely and the striker spring is not so strong that the uncocked striker gives you a slam fire when the bolt closes on a fresh round.
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If it's made after 1918...it's a reproduction
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