The same set of statutes that list the firearms prohibition during a state of emergency also authorize the governor to rescind or modify the applicability of the restrictions via decree of the State of Emergency.
http://www.ncga.state.nc.us/EnactedLegislation/Statutes/HTML/BySection/Chapter_14/GS_14-288.16.html
§ 14‑288.16. Effective time, publication, amendment, and recision of proclamations.
(a) This section applies to proclamations issued under the authority of G.S. 14‑288.12, 14‑288.13, 14‑288.14, and 14‑288.15, and any other applicable statutes and provisions of the common law.
(b) All prohibitions and restrictions imposed by proclamation shall take effect immediately upon publication of the proclamation in the area affected unless the proclamation sets a later time. For the purpose of requiring compliance, publication may consist of reports of the substance of the prohibitions and restrictions in the mass communications media serving the affected area or other effective methods of disseminating the necessary information quickly. As soon as practicable, however, appropriate distribution of the full text of any proclamation shall be made. This subsection shall not be governed by the provisions of G.S. 1‑597.
(c) Prohibitions and restrictions may be extended as to time or area, amended, or rescinded by proclamation. Prohibitions and restrictions imposed by proclamation under the authority of G.S. 14‑288.12, 14‑288.13, and 14‑288.14 shall expire five days after their last imposition unless sooner terminated under G.S. 14‑288.14(c)(3), by proclamation, or by the governing body of the county or municipality in question. Prohibitions and restrictions imposed by proclamation of the Governor shall expire five days after their last imposition unless sooner terminated by proclamation of the Governor. (1969, c. 869, s. 1.)