(a) As used in this section:
(1) "Airgun" means any air pistol, air rifle, BB gun, pump gun, pellet gun, CO-2 gun or similar instrument or device capable of discharging ammunition by means of air pressure or spring action.
(2) "Ammunition" means any leaden or metallic projectile, any pellet, or any other substance capable of inflicting injuries to persons or property when used in an airgun.
(b) No person under the age of eighteen shall use or have in his possession any airgun or ammunition.
(c) The provisions of this section do not prohibit or render it unlawful to use or possess any airgun or ammunition for purposes of instruction in firearm safety, care, handling or marksmanship under the supervision or control of a responsible adult.
(d) No parent, guardian or custodian of any person under the age of eighteen shall knowingly permit any such person under the age of eighteen to use or have in his possession any airgun or ammunition unless such use or possession falls within the exception of subsection (c) hereof.
(e) Any person who violates this section is guilty of a misdemeanor of the third degree.