[TigerClaws]

I haven’t seen a drum magazine yet and it would seem to require on for the 30+ second bursts we hear in the audio from when the shooting starts.

[Meet the New Boss]

In the photo of the weapons on the two chairs pushed together it looks like those large curved magazines could be 100-rounders. From that 2-minute video/audio that was initially posted on twitter it sounded like the first three bursts were 100-round bursts.

[TXnMA]

"I haven’t seen a drum magazine yet and it would seem to require on for the 30+ second bursts we hear in the audio from when the shooting starts."

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I used "ScreenFlow", which is video capture and editing software, to analyze the audio track of that first, regular, sustained burst:

The total duration of the burst was ten (10) seconds.

Average rate was 12 rounds/second.

That equates to a cyclic rate of 720 RPM.