Quote Originally Posted by cdi View Post
One in the gun, one on the belt with a flashlight.
You can never have too much ammo. That said, the second mag is more for addressing malfunction issues and topping off the gun if a shooting has happened.
My spare is more of a ward against malfunctions than more ammo.

If I'm going someplace more dicey I'll switch my gun out (to something with more capacity) before carrying more mags for my usual daily carry guns.