As used in this chapter, the words “air gun” mean and include the following: air gun, air pistol, air rifle, B.B. gun, and toy guns of any kind or nature when so designed, contrived, modified and used to propel, by compressed air or spring-loaded plunger, any pellet, dart, hard-tipped arrow, bean, pea, B.B., rock or other hard substance a distance of more than twenty-five feet with sufficient force to break windows or inflict injury upon persons or animals. (Ord. 628, 1976)