Most kids in 6th grade knew how to make a zip gun out of a car antenna, when I was young. Ready to fire .22, shorts were preferred, but would also chamber LR.
Us`n country boys got a present one year when a 14 year old Bronx ganger was sent to live with his aunt here. First thing he did in English class was to set off a firecracker near his fingers. Our teacher was nice and just asked him if his hand was ok. This shocked the ganger. The next day he taught us all how to make zip guns. It was the best education I ever got.