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I don't think there is enough "meat" in the 7.63mm barrel to actually reline them, even to 7.63mm. The conversion to 9mm was done in one of two ways: 1) the barrel was rebored, rerifled and rechambered, or, if the barrel was really bad inside and out, 2) it was cut off just ahead of the receiver, the stump bored out, and a 9mm barrel inserted and soldered in. The barrel at the front sight was reamed out, leaving a barrel band which was then soldered onto the new barrel. Done well, those look very good, and it is hard to spot the joints once the guns are reblued.
Jim
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