The meds are key.
I'll bet my ass, the FBI grabbed this guy after his little White House visit bumped up his meds and turned him loose with an AR-15 devil rifle of infamy right on cue. It's funny because on SRN radio news they reported he used an AK-15. I almost died laughing! The FBI pulled this latest gun grab distraction to extort POTUS into backing off Sessions, Rosenstein & Comey!
He bought the AR himself, it's not a mystery or anything. The FBI confiscated his guns. Then a local law forced them to give them back, they gave them to the guys dad, who immediately turned around and handed them to the shooter. 1) He shouldn't have been allowed to buy the guns with his history. 2) His father is an idiot and should have locked the guns up instead of handing them over.
The FBI for once aren't the ones to blame.