“Minors are permitted to possess pistols or revolvers under certain specified and monitored activities and there are provisions against a parent or legal guardian allowing a minor to possess a pistol or revolver if the adult “is aware of a substantial risk that such minor will use a pistol or revolver to commit a felony offense” or if the minor has been convicted of a violent felony or misdemeanor. Violation can mean a felony conviction, a fine of up to $5,000 and 3-5 years in prison.”
I would say, having an FBI investigation into a school shooting threat last year would constitute “substantial risk”.
But that’s also assuming it was an AR pistol and not an AR rifle. So far they’re just saying “AR platform” which could mean anything.