I carry 6 30 round GBBR Mags +1 in my rifle. Going to be getting three more to get to a 300 round loadout. I also carry 2 pistol mags and 1 mag in my pistol.

For my AEG I carry 4 TM P90 50 round mags, +1 in the Gun.

Primarily I try and get up to a 300 round primary loadout, as most (that I have been to or heard about) milsim games are 300 round primary caps.

7 mags for M9, 2 mags for Type 97B. I don't often find myself refilling very often throughout the night.