“I even had one guy tell me that he had collected 30 bullets from the ground, and said they came from three different kinds of guns, but he won’t go public with the information.” – Kurt Haskell

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Could the “three different kinds of guns” be these?
5.56 AR-15 — those that Paddock was said to have fired — autos fire more rapidly than most of the shots heard, as well as bumpstock, single shot, which pace can vary
7.62 Larger, belt fed M60/M240 — steady, slower, chunky sounding fire that we likely heard most often during the long volleys. None were in Paddock’s room
9mm — Uzis (or similar) firing within the crowd — Some of the short bursts had only one sound, instead of the delay between bullet crack arrival and the sound of the gun firing that most of the long volleys had
There were also incendiary rounds fired at the fuel tanks. Three shots were heard. Two hit the tanks.

Hear the interview: 

(audio) Kurt Haskell: Vegas [bullets found], Church Shooting, Charlottsville… 11/7/17