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Loosening the screws on the barrel band allowed me to pull the magazine tube clear of the receiver, but it is going to take some penetrating oil and time before the barrel will unscrew.
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Just a small point, but you aren't unscrewing the barrel from the receiver. With the magazine tube pulled far enough forward, and the forend, so the rear end of the action bar clears the receiver, you twist the RECIEVER EXTENSION a quarter turn and the gun separates into two pieces.
If you have the barrel clamp off (or loose enough to freely move) check the barrel and see if it has a lug on it for the proper position of the clamp. I know the model 12 does, I don't remember about the 97. The mag tube clamp CAN be installed on the barrel in the wrong place, which could explain why your gun's "mag tube stop plate" hits the band before the tube is free.
Good Luck, and let us know how it goes!