Jim, they've made some bad gun designs, simply because they could be mass produced cheaply, with less machining, which were really pains to work on. There are several in mind, that if certain parts broke, internally, then one was really lucky if it could actually be taken apart.
I've known of cases where holes had to be drilled or milled out, to get to a broken part, or to give access for some way of holding that part it in place, just to get it broke down, especially in pistols. Then we smiths have to try to hide that away, even welding it back up.
My worst though, was when someone brought in an old RG Bulldog, wanting it repaired, but the repair would cost more than the thing was worth. I actually suggested to a customer once, who brought in a worn out RG, to do with it with it as it was designed for, and drive to the middle of a bridge, and throw it in the river. They weren't called Saturday Night Specials for nothing. Those were the days.