A local firearms attorney would be a big help.
what county of NC are you in?
didn't find anything. http://co.union.nc.us/Government/Ordinances.aspx
but you can look in the county ordinances.
another place to look http://www.ncsheriffs.org/images/2007%20NC%20Firearms%20Laws%20Pub.pdf. or just call the sheriffs office and ask them about it, politely.
Don't forget, there is always the NRA. And, the NRA would just love to hear about this...
I just thought also, if you don't get any satisfaction, you might try the State Attorney General. They're the They're usually the state's Top Cop.