I carry a Calico 9mm with 50 rd mags. One on it (in) and five around my genital region. The chicks seem to dig it.
Joking ...
I carry 3 extra on me, and two more in the car in a little "Lumbar Pack". Only one is on my belt though. The other two are in pockets. If I can conceal them comfortably and easily in pockets, I'll carry as many as I can. I can shoot pretty well at a range, but I've never been in a firefight. I am definitely not going to use range performance in considering spare mags. If we're ever invaded by an alien species made of paper and with similar markings to that of a B-27 target, then I'll be a little more confident as to what to expect. As for now, I'd rather go home with extra unused mags than go down because of a need for one.
John Coleman