Fix a Leaky CO2 Airsoft Pistol Seal

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About: I am a recent graduate of the Sustainable Manufacturing program at California State University Chico. I currently consult with local businesses and provide freelance design work. I've been making things for ...

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.

Step 1: Materials

You need:
  • The leaky gun in question
  • Full cartridge
  • Teflon plumbers tape, available at any hardware store that is worth shopping at.
  • Silicone spray lubricant or Paintball marker oil. Do not use any other type of oil, it will freeze and damage the seal even more.

Step 2: Oil the Seal

Find the seal. If your gun has the CO2 holder in the handle, look up inside that. If your gun loads CO2 into the magazine, look up in there. My gun has the gas in the mag.

Anyway, put a good amount of lubricant on the seal. you should do this after every game before you put the gun away, and, if at all possible, each time you load a new cartridge. Basically, the more often the seal is lubricated, the better.

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!

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    7 Discussions

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    VeryOldGit

    Question 2 days ago on Step 1

    So I can assume this problem cannot be solved with the ubiquitous WD40. Silicone spray only or is silicone grease ok too? I have no problems when sorting out my Webley's A Tempest and a Hurricane. Am a bit nervous of "sorting" the Remington. Regards.

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    NarongchaiN

    5 months ago

    for fixing leaks you can use refill catridge (it looks like co2 catridge) with green gas or normal bb gas cuz' it will re-essamble again and over over again

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    Luke Micheal plumridge

    Tip 8 months ago

    Well I got my first brake barrel air gun 1.77 b. S. A. At the age of 8 years old and I actually sleeped with it. And then I worked my way up to a 2.2 air rifle. Then hand air soft guns. Then I went to live with my sister in Scotland as my sisters boy friend was a game keeper and I was shooting real gun's and I loved it so much I have never been with out a air gun nowadays I brought a xtreme 45 g&g armament very powerful with the first two magazines only getting 32 at maximum pressure and I have had it nearly two years now and I just had to replace the seal in the magazine and the key is to keep it lubricanted with silicone grease every day I used it. And I have taken it apart once as it got a little raterly so I used loctite. 243 lock and seal on the screws due to the blow back. And keeping the barl clean with tools has kept it as new. Well aspecly after taking it to peaces just over a hundred parts. On a special gun matt helped. I even custermised it with my own looks changing the hand grips with real wooden ones. I now considering to buy a glock 19 cal 4.5mm as they are so similar as the real thing apart from its legal. But I not argueing about the xtreme 45 bb gun it's wounder full to shoot and is very accurate I have a shooting range in my big private flat and now I never miss the target's. And I love my airgun club is very good fun with a war game or two. but very expensive. I allso do archery with a stylest recove bow with a club two. Now iam nearly 39 years old I have a lot of practice. Luke plumridge. And learn about safety rules before you even pick a gun up.

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    _pantera_

    5 years ago on Introduction

    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?

    1 reply
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    ilpug_pantera_

    Reply 5 years ago on Introduction

    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.