The short mags can fit in M4 pouches. I've managed to get a couple in there. The longer mags can also fit, but it's a bit more awkward. I've switched to the original M1A1 pouches from ww2 though... however, when I was talking to somebody at a game, he said that UMP pouches should fit the thompson mags just fine. Not sure, you can look into it though.
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