He can have a handgun. He can have a handgun he whittled himself out of cheese wiz or a meteorite. Thats not a question. TN laws allows adults between 18-21 to own a handgun and TN law allows anyone who is allowed to own a handgun to build one from an 80% receiver blank and a parts kit.
He just can't carry it concealed. He was given some bad information and thought he was onto something. Turns out the information he was given wasnt any good but I'm sure thats not going to stop him. Sure as I can be without knowing him. I knew a lot of 19 year olds from Tennessee when I was in the Army. TN has a strong tradition of sending its sons off to the military. I'm sure I'll get flack for saying this but they were an obstinate bunch.
I've said it before. There should be a "thanks" or "like" button on this forum.