The two-judge panel ruled Calvin Carlstrom had not shown "justifiable need" to carry a gun, despite the Roselle Park police chief approving the application.
Attorney General Gurbir Grewal says the fight against do-it-yourself guns from 3-D printers is about safety, not curtailing the First or Second amendments.
Army veteran Leonard Cottrell said troopers came to his house late at night to seize his guns after his son had talked about school safety issues with a classmate.