I am very divided about this issue. While working in LE for many years I carried a 1911 with a couple of extra mags and never felt under gunned. Now that I am retired but still carrying a gun for my present security position I often carry a Glock 19 with an extra mag. When off duty or at home I often carry my Shield 9mm or an M&P 340. I have multiple revolvers and semi autos to choose from so I change as needed. I do think that the statements made regarding the typical number of rounds expended in a civilian encounter are generally true, no one has ever wished for less rounds in a gun fight. There are times when I feel that a 5 shot snub is adequate but usually I want for more ammo on hand, just in case.