So it’s a non-blowback HK USP. Works great. Here’s the problem...i have 3 mags all 3 of which do not hold pressure. I don’t know anything about fixing them. It shoots 350 once the pressure regulates. I’m looking for 50 but will entertain offers and trades. Trades I’m looking for pouches. Specifically a triple M4 pouch in multicam or tan. Also a radio pouch in multicam or tan. Other offers will be considered.