+1. I always carry at least one extra mag no matter what I carry just in case of a malfunction.Part of carrying extra mags,is also for weapons malfunction. Sometimes you might have to dump the mag. that's already in your gun,clear a jam,then insert fresh mag. Most of the time you don't, just slap,rack,bang.
But, as they say,"one is none,two is one".(Clint Smith).
Steve..