As used in this article, the following terms shall have the meanings indicated:
Any gun, shotgun, rifle, pistol, revolver or other device from which a bullet, shot, ball, slug, pellet, solid projectile or other missile is propelled by means of a cartridge or shell or by the action, explosion or ignition of flammable or explosive substances.
Any firearm, air rifle, bow of 35 pounds or more pull, slingshot, spring gun or similar device or instrument in the nature of a weapon in which the propelling force is a spring, elastic band, carbon dioxide, compressed or other gas, vapor or compressed air, or which is discharged by compressed air, and ejecting a bullet or missile with sufficient force to injure a person.