Https://www.crosman.com/contact#contact-form 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.
SOURCE: 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.
SOURCE: Crossman Mark 1 CO2 Pellet Gun
Check out www.mac1.com. Tim can sell you the o-rings or customize your gun to another level (see the LD pistol).
Steve
SOURCE: crossman mark 2 is leaking gas...everywhere
Check out www.mac1.com. Tim is one of the best airgun tuners around and can fix and/or improve your gun.
SOURCE: co2 leaks from chamber on crossman modle400 rifle how do i fix it
Check thare is a rubber o ring missing or broken in the air chamber
SOURCE: I have a Crossman airgun Crosman 357 CO2 Pellet
Click here for the parts list and exploded view diagram showing internal schematic:
http://www.crosman.com/pdf/manuals/C357%20EVP%20&%20PL2.pdf
And here's the owner's manual:
http://www.crosman.com/pdf/manuals/crosman/357/C357-OM1.pdf
Best of luck!
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