I carry 5 GBBR mags on vest and 1 in gun, 30 rounds a pop.
Would carry more but they're expensive but most of all, very heavy. Buckles on my vest actually broke from weight of mags and my hydration back. Now have buckles that can support 700lbs each. =D
How heavy is 1 fully loaded M4 mag anyways? Would it realistic to carry 10+?