Minimum number of magazines- - -
Three.
One in pistol, one spare carried, and one at home "resting."
If something happens to one, you still have the one spare until you can obtain another. This is a MINIMUM for a working/defense piece.
A piece that sees a lot of range or match use needs more, certainly.
A service piece, where the regulations/working enviornment mandate carry of two reloads, would require a couple more.
I'm not talking about what would be NICE, just what I consider a basic number with which to function normally.
Best,
Johnny