Trouble is that I don't have any really good words for those guns, at least not words I can use in a post. I have seen several that blew up, including one fired with a blank (it had been made into a starter pistol).
Most of those guns were made of what is often called "pot metal." Current "experts", including the silly ass who wrote the Wikipedia article on the term, believe it means an alloy that can be melted in a pot. It doesn't. I means the cheap cast iron from which cookpots were made. It is porous, brittle and not at all suitable for use in a firearm except at the very lowest pressure levels.
Anyone who wants to shoot those can do so, including the folks who claim they are super strong. Not me. I would find it hard to type these little notes without fingers.