Unfortunately I have to agree with some of the other post. Owning a firearm is a great responsibility and your fighting criminal teens with immaturity. If someone comes into your neighborhood trying to act like a tough guy with a bat, you call the cops. You don't stand around and arge with him, or say you will not turn him in to the cops if he leaves. If he swings or threatens to kill you with the bat, you shoot him dead. If a gang of teens are knocking door to door lookijng for you, you don't go outside with a shotgun looking for them, you call the cops, if they approch you on your property and threaten you with guns, you kill them. It is that simple.
Still gangs are a PITA and I'm sorry that you were forced to move because of them.