I’m commenting on the possible type used based on the audio I’ve listened to. It does not sound like a normal auto under control of the shooter. It sounds like he has several weapons squeezes, let’s all rounds go then pauses(weapon switch) rinse and repeat
I would tend to agree, but don’t know if this tells anything meaningful about the weapon used, other than they were automatic.
Clearly the fire came in large bursts, followed by sllence, then another large burst... this wasn’t someone trying to maximize accuracy... fire a few rounds, re-aim fire some more... etc... this was squeeze until clip is empty.. reload/change weapon, repeat...