William you will have to buy a 590 magazine tube and barrel. The 500's mag tube has a nut built into the front of it and the barrel has a screw on it to connect the barrel and receiver together. If you replace the 500's mag tube with a 590 the barrel retaining screw will be in the wrong position. Then you will have to buy a barrel for a 590.
If you really want to do that Brownells sells Mossberg parts.
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