My first marker(bought with 16 cause i´m a lucky one with an older brother, german laws say you have to be 18) and my latest one !!!
It went much better, when you know the 1.Gen of Hammer´s Double detents, fps adjust by screw etc.
You can go build one out of a cheap Semi marker. Here i did it with an old Sheridan i´ve got for free. I think a Tippmann98 would be a good Basement !
Disconnect bolt from hammer and build a pumphandle also an upgrade would be detent in the Barrel.