Quote Originally Posted by prosport.177 View Post
I can not comment on Neil's rifle as I have never shot it.

All I know is my 22mm full bodied ally piston has fired 1000s of shots with no problem..

Not sure on Tony s system of 22mm but guess it's on o rings, and has no piston body, neil will know more about his conversion.
I had not realised neil had had issues with it,
Hopefully neil will be able to let some more light onto what went on.
As for cost no idea..
I made my own ,)
what spring you using ?
that seems to be the weak point on many small dia tunes