Have all of you fired full auto as a job?
Indeed.
Yep, but mostly machine guns like the M-60, M-240 and the .50. Very rarely went auto with a rifle unless we were friggin’ around while the more senior folks were gone. 20 Years in military service.
In a prior life...
I have. Your point about no tracers is reasonable. It would have made it even easier. But the combo of optics, the densely packed and large crow, and a well-lighted “kill box”...even a moderately familiar shooter could do exactly what happened.
As for my background, I volunteered to put on cammies, carry an M-16 (sometimes an M-60), and hump an 80lbs pack for 2 1/2 years. Much later I volunteered to spend a week in the field with an M-4 and a M-249. If the now-dead scum had a 249 the casualties at that concert would have been beyond anything imaginable.
Yes long ago