For my MP5s, I have three TM high caps, two G&P midcaps, four TM locaps and four MAG midcaps. All AEG mags are loaded with 12-20 (depending lo or mid) red .12g BBs to use as low ammo tracers (helps me avoid dry firing), then fill with 0.28g BBs, so my mid caps tend to equal Armalite locaps.
Literally, I mix and match for what the game rules are (although my hicaps are rarely used at all, unless it's a loaner for someone who doesn't have much). Two games ago the rules called for 600rds max, so I ran all six midcaps and two locaps.
Pistols, I have six mags for my KSC G19, have a second mag on the way for my KSC MK23, and I usually carry about two 25rd mags for my CA M24.
^^^ Yes, I carry all those when I play, because they all get used.^^^
