I had the opportunity to use the old (WW 1) issue shot gun with the 1917 bayonet mounted on it during riot control duty duty in Japan in 1947. It was an awsome weapon. People did back out of the way of a Platoon size wedge moving towards them in lock step with those nice shiny bayonets and large muzzle holes pointed at their necks. I can't think of a better weapon for riot control.
We were having problems with Japanese Communists at the time.