If you have any experience with Airsoft, you probably know that CO2 pistols like to leak.

There are two types of leaks: Valve leaks and seal leaks.

If gas is coming out the barrel, that is a valve leak and a lot harder to fix.

If gas is coming out the seal around the tip of the cartridge, that is a seal leak.
This is how to fix seal leaks.

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Step 3: Tape the cartridge

Get your new cartridge and wrap about three wraps of Teflon around it. Teflon tape is annoying to work with, as it sticks to itself and is gossamer-thin. It might take a try or two to get good at it. Don't worry if you waste a bit of tape, it's cheap and you don't use much anyway. Once the tape is wrapped, smooth it down with a finger tip.

Then, put some more lubricant on the taped head.

Refer to the pictures.

Yes, you can prepare multiple of these before you play a game, just make sure that the tape isn't unwrapped.

Step 4: Load and test

Load the cartridge like normal. It should leak a lot less. This is not guaranteed to work, but it can't hurt.

Remember, lubricating your seals is a good habit to get into!
Trying this now...
_pantera_1 year ago
I got a gun exactly like this except it is black but when I put a co2 cartridge in it the co2 shoots out where the airsoft bbs go in at. Do you know how to fix this?
ilpug (author)  _pantera_1 year ago
Well, I would unscrew the entire valve and clean it. Replace any damaged seals you see and recoat everything with a good coat of Silicone or GBB oil. Don't be too worried to take it apart, there aren't very many parts.

To take the valve apart, locate the back of the valve on the magazine. It should be a little metal nubbin coming out of a ring with two notches in it. To unscrew this, you will need to stick something into both of those notches and turn it like a screw. I always use the tips of a pair of cheap scissors. Just unscrew that and take all the pieces out carefully.