MP9 and associated pouches.

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Quick and simply question for anyone that might know, I'm planning on getting my hands on an MP9 of some kind, 50 round extended mags... however since I haven't had the opportunity to measure the things im left at a guess as to which pouch to go for to keep 'em nice and tidy.

From what ive read, most people are using MP5 pouches to good standard and success, whereas P90/UMP mags are just a little too big. What I was considering was a Pop Flare pouch or Large Torch pouch, from images, they look like they might be nice snug fits. I would appreciate your thoughts on this, even if you haven't held or owned a MP9, obviously those of you with an MP9 or pop flare that might have something to say, do so!

Cheers.