Teen accidentaly shoots himself in the head.

Your use or non-use has nothing to do with classification of an object.
Firearms are manufactured as weapons, and sold as such, unless explicitly made for target practice. Hunting guns are weapons too because you kill things with them and that is their intended purpose.

Or you could always try and argue with a local judge when buying a handgun that you don’t need a permit for it because you intend to use it as a doorstop.