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Even though it's rebar, as thick as it is, the walls are a good bit oversize, so I doubt there would be any chance of rupture, especially with 22 LR. Now wear, though, is something different. The rifling may not stand up long, since its generally no more than 0.002" deep. However, if he does shoot it out, put a liner in it.
That is easier to turn than you think, with a four jaw chuck. You have to turn two concentric bosses on each end, one is finally threaded for the action, the other parted off at the muzzle. I highly doubt he got it dead center of the O.D., but probably close. In other words, the bosses and the bore can be offset from the OD, and still be straight. The key is the layout, and finding the centers using V-Blocks and a layout gauge.
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