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Getting weirder...

Las Vegas killer had an arsenal of 42 guns, 23 in his hotel room and 19 in his house, police say

http://edition.cnn.com/2017/10/02/us/las-vegas-shooter/index.html?sr=twCNN100317las-vegas-shooter1029AMVODtop

According to news and pictures that I saw on Zero Hedge, several of the rifles had "Bumpfire" stocks. You can effectively shoot a semi auto rifle as a full auto with a bumpfire stock with a bit of practice. That would explain the slower cyclic rate of automatic fire heard in the video.
Apparently there was at least 1 fully automatic rifle in the room. As he was a rich dude with no criminal record, he could have legally bought a full auto weapon from a class 3 dealer.
There was also a rather gruesome picture of him laying on the floor with blood pooling around the back of his head. From the picture, it looked like he put the barrel of his revolver, also in the picture, into his mouth and pulled the trigger.

Here's the link to the story on Zero Hedge. In the pictures of the guns, you can clearly see the bumpfire stocks on a couple of the rifles. There's also the picture of him on the floor.
http://www.zerohedge.com/news/2017-10-03/vegas-shooter-filmed-himself-during-slaughter-suicide-photo-emerges