ok yea you're right, the firing pin in the gun is going to go through the stem of the pipe and set off the shotgun shell that somehow fit into a tube made just for it's size when something of a considerable size is already in this tube.. so not only does it have to defy physics once, it has to do it twice, first the shell has to find it's way into the barrel which is pretty much the same diameter of the barrell, even tho something is blocking the clear path for it to enter this tube, then, after it defys all logic and physics, the firing pin of the gun has to go through the stem of the pipe to set it off (tho there is a small chance that the firing pin could just hit the stem of the pipe and if the stem happened to have a raised part right at the spot where the firing pin hits the shell,, but that's like so unlikely we'll just exempt it)

yea of course this isn't how guns should be handled and it could be dangerous... but fuck, there are a hell of alot more dangers all around you then an unloaded, uncocked shotgun, you're trying to make this whole thing seem like it's super-ignorant/dangerous.. which it's not.... find me an online report where it says even one person died by getting shot by the gun being used while doing this...