Going Goetz on an attacking mob of feral, diverse yoots is going to become very popular in 3...2...1...
Did you know that a Saiga shotgun, properly tuned and polished, can get to a cyclic rate of around 350 RPM?
Some of them have been successfully converted to Class III full-auto, short-barreled weapons.
With a 12- or 14-round magazine or a 20-round drum, that could do some damage ..... and lots more controllably than with a Street Sweeper of 20 years ago.