FBI RETURNED Ft. Lauderdale shooter's gun a month before airport attack after he reported himself because he thought the CIA was making him fight for ISIS
http://www.dailymail.co.uk/news/article-4097416/Gunman-picked-passengers-sent-crowds-fleeing-airport.html
I HAVE NEVER HEARD OF THE FBI TAKING A FIREARM FROM ANYONE ( UNLESS THEY DISARMED A SUSPECT AT A CRIME SCENE WITH PROBABLE CAUSE) --UNLESS IT WAS FROM A CRIME SCENE AND THEN IT WAS FOR FORENSIC ANALYSIS AT THEIR EXCELLENT FACILITIES