Hi Evert.
I've seen a few variations in 35 Pistons so I expect the 50 to have had the same variations over the years.
Hi John.
The piston I've been playing with is all steel and originally had a synthetic HW seal and a stroke of 65mm, whether later 25mm 50s changed from a 65mm stroke to a 69mm stroke in line with the HW35 I couldn't say.
I don't really need another gun but it would be nice to see what could be done with this little thing.
I really should dig out the original barrel and date the action from the serial number to get an idea of it's age and history
All the best Mick