I think an important part of these magazine pouches should be holding balls in while running - not sure how well average magazine pouch works but MILSIG (who originally designed the mags Rap4 uses) makes theirs with a "T" or something inside of a mag pouch to help keep balls from falling out prematurely.
http://www.milsig.ca...products_id=314
If SpecOps could find a cost effective way of doing these...well it'd be great because these are EXPENSIVE!

(My friend just got a used MILSIG and has no way to carry his mags - has an old Broadsword 6-style vest (Tippmann one? from local field) but the mags bounce around in the built in pouches). It DOES, however, have MOLLE up by his shoulders