I remember years ago hearing the de-brief of the off duty officer who stopped the mass shooting at the Trolley Square Mall in Salt Lake City. He was carrying a Kimber 1911 with only the 8-round magazine he had in the pistol. He said it was the worst feeling of his life knowing that was all he had.

Fortunately, it worked out okay, but a good lesson to carry a reload (or two) no matter what pistol you're carrying.