Since I assume you want adult dialogue: a brain doesnt magically appear at 28, .most 18 or 20 year olds do not shoot up things (gangs excepted), the definition of mental illness is vague as is the means to detect it before hand. Right now the AR is demonized, but there are lots of choices, even .22 lr. I have not given a lot of thought about what I would choose, as I am not of a mindset to commit murder; but a 12 ga pump with buckshot would probably be devastating
