Personally my preference for a decent chest rig would be the Hayley strategic DC3RM along with the drop down pouch, I run that along side a shooters belt and am able to run 5-6 m4 mags comfortably along with a few other necessities, sometimes I’ll also run a flat pack if I need to carry a hydro pouch and extra ammo, but obvs all depends on budget as it can be a rather pricy setup 😂