I think there's a lot of risk in something like that, for what gain? He hasn't shot it yet, or at least hasn't said so, and hasn't contacted the smith to make a determination. If I was the gunsmith who did the work, I'd be willing to reface the tenon if necessary, as a good faith gesture, but not if the customer had gone at it with a tool of any sort, at that point I'd want it back to check the whole geometry. In my line of work (not gunsmithing) I fix my own mistakes for free, but if the customer messes something up after I hand it off, I'm billing for it.
OP, do what you want, but my recommendation is still to ask your gunsmith before doing anything other than just shooting the thing.