Tried with both a steel top hat (piston weight) and also a delrin one, the steel version (due to length) gave more pre-load but, I could not detect any real difference between the two (other than the obvious power variance). If you can be patient (not a virtue of mine ) and promise to send it back!...

it was found

i clean my EV2 barrel approx 200-250 shots. when the barrel on mine gets dirty the POI starts rising due to power climb.

could i ask you, when you tried the standard piston with longer latch rod+ mk2 spring did you use the piston weight or just a slip washer?
Gary.

thats a magazine

i shoot with Nick in the same comps. he has advised me that the light piston is not really compatable with the pro sport. due to the lighter weight i would require greater preload to achieve the power. the pro sport has a small dia cap screw which retains the cocking linkage to the compression chamb...

how did your results go with the standard piston and longer latchrod. the reason i ask is with an aluminium piston you would require a stronger spring or greater preload to get the power. also what spring did you use in your tests.
Gary.

the police investigated

is a mistery

might help if you put a price.