(a) As used in this Code section, the term:

(1) ‘‘Dangerous weapon’’ shall have the same meaning as provided for under Code Section 16-11-121.

(2) ‘‘Firearm’’ means any handgun, rifle, shotgun, or other weapon which will or can be converted to expel a projectile by the action of an explosive or electrical charge and which is not a dangerous weapon.

(b) Any instructor who lawfully instructs, educates, or trains a person in the safe, proper, or technical use of a firearm shall be immune from civil liability for any injuries caused by the failure of such person to use such firearm properly or lawfully.