as to internals, who knows I know it shoots spot-on and 780fps with 8.4gr Exacts so whoever did the piston / seal adapter it works nicely
as to the seal, I replaced it soon after purchase with one from a local shop (maybe should have mentioned this?) and had to re-size it slightly, if memory serves it may have been a HW55 replacement?
I cannot remember what happened to the one I removed OR its colour
If you could find it it'd be appreciated
Rich.