A knowledgable gunsmith would take .050 off the face of the barrel and ream the chamber for the AI. That would clean up the existing chambering and place the roll mark in the proper position. If you don't clean up the original chamber, your neck area will have a ring in it due to the angle change. If your smith already has the reamer, it shouldn't cost too much. If he has to buy or rent a reamer, expect a little more cost.
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