If you are encountering problems with your CO2 Magazine of your pistol, here are solutions to fx them from Reapers Airsoft... "HiHo, because it can come again and again with GBBs to problems with CO2 magazines, here are two possible solutions if the problem is due to the valve or on a wobbly magazine. Especially with the KJW (KJ-Works) KP-13 GBB this seems to be the case."