If you have a BB gun, dreaming of it may be simply expressing your enthusiasm over it, but keep in mind what you use it for in your dream. Do you shoot it to let off steam and anger, or do you have fun as in recreational purpose? The BB gun may be pointing to a more sensitive inner emotion you may be trying to suppress. If you don't have a BB gun, dreaming of one symbolizes your very young and innocent exploration into the unknown, dangerous, or adult world.