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"but those same arguments are even better arguments for carrying a backup gun"

If I carried a spare gun, I would want a duplicate of the 1911 I carry so that manual of arms is consistent. Carrying 2 1911s would be bulky (hard to conceal) and heavy as compared to two spare magazines. Most people carry something small like a bug (for a second gun) that will handle differently and have a much shorter useful range. I can reload as fast as I could produce a second pistol that would not be in a place for rapid production. Also, unless dropping one pistol and drawing a second is practiced frequently, it could be a disadvantage to spare magazines. My preference is for spare magazines and maybe a small bug hidden away for last ditch (if I carried it at all).