I pulled my gun out, loaded a C02 cartridge, and closed the quick changer. Well, once I had it closed, it was leaking like crazy. And yes, I have broken it in. I've used it several times before, but when it comes to game day, it leaks. What should I do to fix it? The leak was coming from the quick change area, maybe even the screw that's on the bottom of the gun. And yes, I tried several 12 grams. Thanks.