(a) It shall be unlawful for any person to knowingly permit a child under the age of 12 years to have access to, or possession, custody or use in any manner whatever, of any gun, pistol or other dangerous firearm, whether such weapon be loaded or unloaded, unless the person has the permission of the child's parent or guardian, and the child is under the supervision of an adult. Any person violating the provisions of this section shall be guilty of a Class 2 misdemeanor.
(b) Air rifles, air pistols, and BB guns shall not be deemed "dangerous firearms" within the meaning of subsection (a) of this section except in the following counties: Caldwell, Durham, Forsyth, Gaston, Haywood, Mecklenburg, Stokes, Union, Vance.