I work in a prison. We have 40MM grenade launchers for gas during a riot. Not a big deal. The biggest challenge I had as an armorer was to keep them from rusting because we never use them. Better to have and not need than need and not have.
CC
When I was in the service, they trained us with the M-79. They certainly had tear gas rounds and I have no problem with that. Now the WP rounds they had us use . . .