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Right now it isn't clear, exactly, what weapon and modifications where used. This piece is being updated as we find out more https://www.nytimes.com/2017/10/02/us/las-vegas-mass-shootin...

I do not believe it is known yet. Most of this is speculation. Hence the analyzing the fire rate.

judging that the 90 shots in the article were done without clip change i'd speculate (based on quick Googling as i haven't touched any weapons since AK74 shooting exercises during ROTC training 24 years ago) that it was something like 100 rounds double drum AR15. The rate of fire during stretches - 11-12 per seconds suggests that the rifle itself was probably either bump stocked or converted to fully automatic. According to some news the guy also had AK47. AK has slower rate of fire - 10/sec, so that specific sound clip in the article is of AR15 not AK (there are some other sound clips from the shooting that do sound like AK).