The guy obtained the rifle, whatever it was, and handgun from some sort of LEO using a Remington 870 pump action shotgun, probably the most common shotgun in America so banning assault weapons wouldn't have stopped him.
As far as background checks go, he wasn't a felon and he wasn't dishonorably discharged from the military so there's no disqualifier there. The shotgun was obtained legally and not through any "gun show loophole". Banning private forearms sales wouldn't have stopped him.
The guy obtained the rifle, whatever it was, and handgun from some sort of LEO using a Remington 870 pump action shotgun, probably the most common shotgun in America so banning assault weapons wouldn’t have stopped him.
Just shows that shotguns must be banned too.