If I was looking to do bad I wouldn’t use a drum or belt-fed myself, but with these nutcases, they mostly know what they see in the movies.
Something about that automatic fire at the concert doesn’t sound quite right but I have no idea what’s going on. Sounds like a heavier caliber than 5.56 though - maybe 300 Blackout.
I was puzzling over the sound of the shots sounding weird. Cell phones mics and digital processing along with the shape of building involved are probably the cause of the strangeness.