The problem is that I don't know what I don't know. The issue is that the gun has sat for over 3 years since it was made. I suspect that the orings could have dryrot. Not yet able to afford to get a pump so I'm not able to test my theory.If you post a parts diagram noting which orings you need, I will help you out with sizing. I have a hatsan gladius. The gladius is the same action as the AT44.
Thank you for your response
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