Be curious to see if he had a `Slidefire’ on the AR. His target was a huge group of people and accuracy wasn’t that important. Doesn’t sound like he was really aiming, might have just laid down a beaten path and people were walking right into it.
beaten zone
http://www.trngcmd.marines.mil/Portals/207/Docs/TBS/B3N4478%20Machine%20Gun%20Employment.pdf
Shooting straight down there was very little deflection.
I forget the name for that kind of shot.