(vids) Vegas smaller caliber fire sounds like suppressed UZI 9mm — Compare to unsuppressed UZI and M60 (7.62 chunkier sounds we hear in Vegas videos?)

To me, the Vegas from-the-ground shots sound like these suppressed, likely-subsonic, 9mm rounds, less the thump echo. ‘‘Shooters on the ground’ likely used a pistol version of some type of mini UZI.
In the Vegas crowd videos, it’s important to separate the shots’ brighter, nearby sounds from the thumpier, distant or echoing back ones.
These sounds are completely different than the chunkier, M60 sounding rounds. See:

(vid) Detailed Machine Gun Sound Analysis – Las Vegas Mass Shooting — 13:25 “That’s guaranteed two shooters, minimum” • 09:55 “If you listen carefully, you’re going to hear BELT FED, automatic weapons going off from two different locations from two different sounds” • 11:07 “The shooter is close. See that high pitched sound? You would not hear that from 500 meters”

Three videos below:

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https://www.youtube.com/watch?v=7JXUCj5RG_s