EYEWITNESS: Chilling footage of moment active shooter opened fire on concert goers near Mandalay Bay resort in Las Vegas pic.twitter.com/7OfAwg0ReO
— Josh Caplan (@joshdcaplan) October 2, 2017
A quick analysis of the eyewitness phone footage from the Las Vegas shooting on October 1 shows that the shooter fired at least four, 10-second bursts of approximately 100 rounds each. That’s a full-auto rate of fire for an AK47 or equivalent using 100 round drums.
In the audio spectrum view below, each sharp vertical line represents a gunshot. It can be a little unclear at times because of the echo, and the background noise. Because of the slightly inconsistent rate of fire, some commentators have suggested that the shooter used a trigger crank, rather than a fully-automatic rifle. Either way, the rate and duration of fire does not suggest a stock AR-15, as has been discussed in the media.