Thank all. I've never owned a pump action shotgun so never had occasion to try to slam-fire one. I do know that you can slam-fire the heck out of a Winchester 61 rifle and that as a kid I thought it was a pretty neat trick. I sure wasted a lot of .22 ammo back then; couldn't afford to do it now even if I wanted to.

The difference between genius and stupidity is that genius has its limits. - Albert Einstein