As anal-OCD as I am, I have several guns I don't know exactly how many mags I have, two three four not sure don't really care. But for my regular carry guns I go by the theory that too many is almost enough. Both of my regular carry guns can use the same mags for reloads. I also have a carbine that uses the same mags. Then I have maybe three dozen mags for that collection, many still in the wrapper, so I think I'm covered. Until I buy a few more. Spare guns for the mags is a separate question.