Czp09 gas venting after 10 shots

[Bradders13754]

Can anyone help  my CZP_09 with a co2 cartridges is venting gas  after 10 shots has anyone else had this issue could it be the mag or the internals.. I have been told it may be the gas knocker spring or the hammer spring or both that may have gone or could it be the mag any help would be great. 

Cheers
Mark

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