Spent a bit of time on the Walther and got it stripped down.
’
Interestingly tho it seems to have a different piston from what I’ve seen and read about them this afternoon. After removing what was left of the old seal I found it’s not a seal that fits into a groove round the head, but more like a more modern parachute seal that seats into a groove inside….. Possible aftermarket or variations during production???????