I'm using Fobus "Double Magazine Pouches S&W M&P 9mm, .40 cal" for my M&P9 mags - working out fine so far. They're on the cheaper side - they don't have adjustable tensioners but rely on fuzzy-sided velcro patches inside for tension. I've read that they fail after a while, FWIW. But hey, $20 for a double pouch off of Amazon...