Quote Originally Posted by look no hands View Post
I weighed the spare piston I have and it comes in at 231g so I'm not sure what the best weight for it would be?

Pete
The Norweigian guns (FAC) have steel piston weights plus two steel washers in front of the plastic piston liner.
I remove the piston weight and fit a delrin tophat with the Titan spring. I keep the washers in front of the liner.
This gives 11-12fpe depending on calibre and gun, and a very nice shotcycle.