Section eighteen hundred and ninety-six . . . [is] hereby amended . . . § 1896. Making and disposing of dangerous weapons. A person who manufactures, or causes to be manufactured, or sells or keeps for sale, or offers, or gives, or disposes of any instrument or weapon of the kind usually known as a blackjack, slungshot, billy, sandclub, sandbag, bludgeon, or metal knuckles, to any person; or a person who offers, sells, loans, leases or gives any gun, revolver, pistol or other firearm or any airgun, spring-gun or other instrument or weapon in which the propelling force is a spring or air or any instrument or weapon commonly known as a toy pistol or in or upon which any loaded or blank cartridges are used, or may be used, or any loaded or blank cartridges or ammunition therefor, to any person under the age of sixteen years, is guilty of a misdemeanor.