This question was posted under Firearms in the past with no luck.
Our department is looking for tactical vests for our officers that will accommodate 2 spare FN Herstal P90, 50 round magazines. I was told a vest for Colt SMG would hold the P90 magazine, it does not. I have had companies send a few to me to T&E (Blackhawk included) and nothing has worked. Magazine dimensions: 11 in long X 2 in wide X 1 in thick.