Cherry max H781-456 assistance needed

[Sntry]

Is anyone using the cherry max pneumatic gun with the H781-456 ? I purchased one from ebay and have been able to pull cherry max rivets. Unfortunately, at least on my unit it doesn’t seem to pull the CCPS-04-02. Although, CC photos show this has been used to pull these rivets. Has this happen to other users? Any suggestions on how to solve this issue?

Thanks,

Jaime