that tac m7 vest should hold 16 mags (4 per pouch). that should be enough lowcaps for most cqb encounters, but you could always use midcaps as well. some generic chest rigs that hold 3 m4 mags/pouch will hold 6 mp5 mags. generally for all my gear each m4 mag=2 mp5 mags as far as storage capacity is concerned. a dump puch is handy for those spent mags, too.
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