(A)   Definition. The term FIREARM means any weapon which is capable of, or designed to, or which may readily be converted to expel a projectile with deadly force by means of an explosion.
   (B)   Discharge prohibited. It shall be unlawful for any person or persons to fire or discharge, or cause to be fired or discharged, any firearms within the city limits.
   (C)   Exception. This section shall not apply to any police officer in the discharge of his official duties and while in the exercise of reasonable care, nor to a person using a firearm in self-defense.
(`84 Code, § 6-7) Penalty, see § 10.99