Sorry to hear of the problem, but I think you identified the reason for the point-of-impact problem. I would guess that turning the barrel the additional 1/32 of an inch (or whatever it is) would true up the sights and give you the accuracy these guns are capable of. A gunsmith should be able to tell you if the barrel can be torqued the extra amount as is, or whether you need to take a bit off the back face of the barrel to make it fit correctly.

Don't panic. All is fixable.

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David Wilson