See?
Seriously, though, that's one of the unintended consequences of modular, easy to detail-strip pistols supported by a huge and burgeoning aftermarket: The democratization of *&^%-ups.
It used to be that you needed a file, an Arkansas stone, maybe a Dremel, and a fair amount of mechanical ineptitude to mess up your heater. Now any yob with a punch, a YouTube video, and enough manual dexterity to tie his own shoes can shoot himself in the grape with a runaway gun. You can buy drop-in mistakes; no gunsmith fitting required!