Quote Originally Posted by dvd View Post
Agree with that 100%.
The FWB 300 rifle uses a split ring as well, though I am sure steel ones with a stepped split section (higher performing) are advertised as non original replacements.

I think there is absolutely nothing that a half decent split ring cannot handle in airgun cylinder pressures since they have been used for ages in high compression turbo-charged diesel engines and last many years in the harshest compression cycle one can imagine.

I think a reasonably competent person with a lathe can turn a few rings effortlessly if the cylinder bore is still true and the piston groove/cylinder dimensions are known. I would hate to loose more of what little power these fine pistols make by fitting leather washers.
Not sure how relevant the very different set up in a diesel engine is?

But refer back to the opening post and the link there - my MKI with leather washer is reasonably powerful and certainly trumps my Senior with piston ring that doesn't seal...