So recently acquired a nice lgv in a Warren Edwards stock the idea being shoot a bit of ft with a standard gun .
However I have a spare piston 🙄. After comparing it to vernals at the bash I was going to go down the Jim Tyler route ie tx mk 3 spring 3 mm trans port.
The gun was only doing 10.4 fpe with express (177), so took it apart, all standard, nicely sized seal, but missing a top hat .
I made an o ring nose for the spare piston , put it back together with a smear of moly, and it made 11.2 fpe and very consistent , same soft comfortable firing cycle , so made a top hat with a slim shoulder , now 11.5.
So all in all a good 1 fpe improvement for more or less the same spring.
So much for keeping it standard, I liked vernals that much will shoot this for a bit and then put the mk 3 spring in .

https://photos.app.goo.gl/drURhnFfBKMWXAui9