When I got home, I racked the slide back to clear it and I saw this:

Let's look a bit closer...

Yep, completely sheared off. Here it is disassembled, and a close-up:


Anybody have any suggestions or ideas why this might have happened?
The only thing I can think of is the pin must have worked loose while shooting and gotten sheared off either while I was shooting or by me racking the slide... which is disconcerting at best.
On a related note, does anybody know of a good single-stack 9mm carry pistol?
Looks like I'm in the market, because I don't trust Kel-Tec any more.