I might be wrong, and the vaz, although next time I might use something a little better in the lube dept.

GET A TUBE OF PELLUBE!
Crosman have probably more experiance of producing pneumatics and co2 arms than almost any other company.
Most of these "dumping" the co2 problems happen because the "o"rings get snagged/torn through the lack of a lube on the surface of the seal or the chamber.
Don.