I can't really speak to the other comments made but the problem with mp5 mags isn't their length but rather their width, or lack there of. The most common pouch type out there is for m4 mags, which can be used in a pinch for ak, g36, m14 mags but using them for mp5 mags, unless you use mag clamps, tends to cause rattle. Finding mag pouches made specifically for mp5 mags is a bit of a pain.
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