Reported so far, 50 dead and 200 wounded after about 5 minutes of shooting. Horrifying.
You can hear gunfire in the short clip from twitter posted below. It sounds like a fully automatic weapon , which is heavily restricted by the federal government -- a lot of money and hoops to jump through, but some people own them.
It's possible that the weapon was an illegal conversion, or more likely an assault rifle fitted with a barely legal bump fire stock. Though technically a semiautomatic, a gun fitted with the latter is effectively an automatic weapon and, IMO, should be illegal. Since the NRA owns congress, I don't expect to see a change in the law.
Watch the demonstration video at the link above. I can't see any civilian uses for that weapon other than thrills or wounding and killing of a couple of hundred people in minutes.
The audio on this video seems to suggest that there is indeed at least two distinct sources of gunfire. pic.twitter.com/UI2ztOhNH8— Patrick (@TrickFreee) October 2, 2017