Quoted:
I'm an exception. I don't carry an extra mag for my G19. Why not?
1. I test the mags I use. Mags that fail get tossed. I only carry genuine glock mags.
2. My malf drill is tap, rack, bang. This solves most malfunctions, and is what I train for.
3. I have a very hard time envisioning a situation where I need more than 16 rounds, for where I normally am. If I leave that area, I often carry one or more spare mags.
4. I can't find a comfortable way to carry a spare mag. Glock mags aren't exactly small. If I carried a 1911, then I'd probably carry a spare mag.
Does this mean that murphy might catch up with me? I suppose so. But you can't plan for every far-feched situation.
I can't find reference to a single case where a person in a CCW situation would have had the outcome changed by having an extra mag for a high cap pistol. Cops? Sure. Home defense? Yeah. But private person CCW? I can't fine one.
I don't recall who it was, but I remember reading about someone who was driving on a trip one time. The short version is when he got to the hotel that night he noticed his gun didn't have a mag in it. Somehow the mag release was pressed while seated and dropped the mag in between the seats.
While I don't think this is going to happen to me, I would say the odds aren't that much greater than me actually having to use my gun in self defense.
The moral of the story is you just never know what could happen.