Looking at it, State wise, he may be safe.. the prosecutor would have a fairly circular argument to make that it isn't a firearm, it's exempted from the list in Subsection 6 or 7, whichever it is, and to then go back and back door it in the next section would be violating framer's intent...
But this is all well after the fact and not guaranteed. And doesn't avoid the other minefields out there like the School zone. The Feds still might call it a firearm, and if you're within 1000 yards of a school zone, which is pretty damn hard to avoid in an urban setting....