Were the weapons found in the room even capable of 1200 yd range?
They were shooting .223 out the window weren't they?
If they got 10+ weapons into that room unseen, what are the odds they got a .300 caliber sniper rifle out unseen.
The whole story of the security guard is beyond bizarre. I think he was involved or paid off.
I suspect this was a cover for an assassination of someone who flew into McCarron International. They shot him and he was whisked out of the country before they knew he had been shot.