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Crossman mark 2 is leaking gas...everywhere

When i put the co2 in my gun it leakes with a hissing sound mostly out of the bottom, and i can't find O rings anywhere. Where can i get some??

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Check out Tim is one of the best airgun tuners around and can fix and/or improve your gun.

Posted on Nov 19, 2008

  • scordani Nov 21, 2008

    correction to solution:

    web address should be


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Same size washer (o ring) is availible at most hardware stores... Replace the washer and it will fix your problem. I got mine at Ace hardware.

Posted on Jul 07, 2009

  • Pickergibson Sep 14, 2010

    Contact Phils Vintage Airgun Repair (330) 477-3298. He's located in Dayton Ohio and he's a great guy to deal with and VERY reasonable. He re-sealed my vintage Benjamin 342 .22 caliber pellet gun for only $35 and I wasn't even able to find a repair kit to fix it myself that cheap lol! I also have a Crossman Mark 2 with the same leaking problem. He said $32.00 to re-seal it! I plan to ship it to him soon. Good luck!



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Posted on Jan 02, 2017

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1 Answer

I have a Crossman 30 8T vintage 22 calibre from the 70s that leaks CO2 I was told that the gun was too powerful and can’t be fixed is that true If you fill out the form at the above link, a corpsman expert technician will get back to you with an answer to your question. They may be able to sell the parts needed to fix it, and/or repair it for you.

Mar 20, 2018 | The Optics

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Hi, I am trying to remove a brand new CO2 cartridge I just put in a new Gamo PT-85 Blowback pellet hand gun. As I'm unscrewing it, gas is leaking out. HELP.

Hello K Brink,

There is no going back... Once the CO2 cartridge is
pierced... there is no way to salvage the cylinder
until it is FULLY expended...

If you unscrew the chamber the CO2 will ALL be released.

Just ONE word... If your cylinders are depleted... ALWAYS
check that the SEALING O-ring stays with the hand-gun.

Just make sure yur SEALING RING is still in the "gun"
and NOT STUCK to the ... co2 CARTRIDGE.

I am just saying...

((been there... Done that))...

Carnac the Magnificent

Nov 29, 2017 | Gamo Optics

1 Answer

I have a Crossman 1077 air gun that leaks co2 when I install need to get it fixed

They are not repaired, sorry been there done that with two of them. Never leave a charged CO2 cart installed, it blows out the seal.

Jul 12, 2017 | Optics

1 Answer

I have an older Crossman BB gun marked "Crossman

Time to buy a new model. I had 2 of those with similar problems and couldn't find parts. Try the CO2 model 1088. I'm happy with mine. Spray the seals with silicone spray monthly or every 2 cartridges.

Sep 10, 2011 | Air Tools & Compressors

2 Answers

Have a crossman 1077 airgun but when I put in the CO2 cartrige it empties the gas. Used very little. Is there a home remidy or send it out to fix.

I would send it of to fix, playing with compressed gas is dangerous, sound like a seal my have corroded.

Feb 13, 2010 | Crosman (4032)

1 Answer

My crossman 1008 repeatair bb pistol co2 leaks

mine also leaked. took it to a store for repair and cound not do anything. After a year in the drawer, I took it out and took off the grip and then I got a jewelers screwdriver and tightened the gas seal. Now it works.

Dec 26, 2009 | Crosman (4032)

3 Answers

I have a crosman c11 that leaks gas

Ya your better spending the extra money on something with quality

Aug 12, 2009 | Crosman (4032)

1 Answer

Bb gun trouble

Could possibly be simply the time it takes to pierce the seal until it actually seats itself on the gasket. I usually wind up the screw until it is ready to puncture the seal and then I wind up for a quick twist in order to make it seat quicker.

Aug 19, 2008 | Optics

4 Answers

Crossman Mark 1 CO2 Pellet Gun

Check out Tim can sell you the o-rings or customize your gun to another level (see the LD pistol).


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