Well, I’ll admit that the first few times I heard the videos that everyone was playing Monday, I thought “Dang, that sure sounds like an M-60!!!”.
Even teased myself that I could hear the links and brass falling on concrete below (which of course is pretty dang unlikely from ~500 yards away, what with all the other noises going on).
But it probably wasn’t what it sounded like to me.
(ex Army Ranger)
I thought the opposite.
Definitely not 7.62.
Should be able to find a recording audio and determine the cyclic rate of fire and at this stage find rounds which were shot to verify the weapons used.