well, I think the Federal law is still 21 to buy a handgun, even an Uzi (unless banned in particular states), so I doubt many high schoolers are legally obtaining handguns (I may be wrong since I don't keep up with changing gun laws)
However, obtaining a rifle or shotgun is achieveable for an 18 year old in many states.
However, obtaining a rifle or shotgun is achieveable for an 18 year old in many states.