From the NRA-ILA page: http://www.nraila.org/gun-laws/state...-carolina.aspx
So the good news is that NC has some form of preemption but the bad news is that they still allow localities to ban firearms in parks or recreational areas (and buildings).
PREEMPTIONAll regulation of firearms or ammunition is reserved to the state legislature. READ ALL
N.C. GEN. STAT. ANN. § 14-409.40. Statewide uniformity of local regulation
(a) It is declared by the General Assembly that the regulation of firearms is properly an issue of general, statewide concern, and that the entire field of regulation of firearms is preempted from regulation by local governments except as provided by this section.
(a1) The General Assembly further declares that the lawful design, marketing, manufacture, distribution, sale, or transfer of firearms or ammunition to the public is not an unreasonably dangerous activity and does not constitute a nuisance per se and furthermore, that it is the unlawful use of firearms and ammunition, rather than their lawful design, marketing, manufacture, distribution, sale, or transfer that is the proximate cause of injuries arising from their unlawful use. This subsection applies only to causes of action brought under subsection (g) of this section.
(b) Unless otherwise permitted by statute, no county or municipality, by ordinance, resolution, or other enactment, shall regulate in any manner the possession, ownership, storage, transfer, sale, purchase, licensing, or registration of firearms, firearms ammunition, components of firearms, dealers in firearms, or dealers in handgun components or parts.
(f) Nothing contained in this section prohibits municipalities or counties from application of their authority under G.S. 153A-129, 160A-189, 14-269, 14-269.2, 14-269.3, 14-269.4, 14-277.2, 14-415.11, 14-415.23, including prohibiting the possession of firearms in public-owned buildings, on the grounds or parking areas of those buildings, or in public parks or recreation areas, except nothing in this subsection shall prohibit a person from storing a firearm within a motor vehicle while the vehicle is on these grounds or areas. Nothing contained in this section prohibits municipalities or counties from exercising powers provided by law in declared states of emergency under Article 36A of this Chapter.