“...Then how did he get the rifle? Girlfriend?...”
Apparently, he had way more than one and verrrrry expensive weaponry. So....who, or what entity, has the most to gain from this?
Either provided by ISIS thru the girlfriend and smuggled up thru Mexico....or, our own beloved UniParty. NOTHING would surprise me about either entity in something like this.
How much would 500lbs of ammo and all those guns cost? Could he afford the cost or would he need to be funded?