Lately I’ve been ccw’ing my Glock 32. Have 1 full mag (13) and one in the pipe. I’ve never felt the need to carry a spare mag.
The purpose of your little gun is to fight your way back to your big gun . . .
I don't carry a spare. I have confidence in the mag in My gun. In 1976 when I was at Gunsite the first time I asked Mr Cooper why He didn't carry a spare. His reply was " If I need more than 8 rounds to solve the problem, there is a good possibility that I won't survive the conflict."