I wear a plate carrier with HSGI pouches and a Gun fighter belt.
Granted this was mainly for Airsoft but I went 3 double M4 pouches across the stomach, Grenade pouch on the top left center, utility ouch on the left side, extra grenade pouch on the back shoulder (stacking up) and a camelbak. On the belt I would go pistol in a lvl3 Safari, on the back a dump pouch, left side 3 m4/pistol mag stackers. And a flashlight back side off the dump.
The main point is super easy when prone to grab the offside mags off your belt, still able to grab off the stomac if really pressed and a 100% clean right side to draw the pistol in any position with no sweep.
Alright start your laughing at the Airsoft but it works and even though your not in live fire nothing puts the mag change pressure on as another person taking shots at you. I also wear full plates, full team wendy helmet and Arc'tyrc combat pants and shirt, if it's cold I tuck my soft shell jacket into my belt and it works no problem.
Good luck!