They never match. They are always different.
Ted
Wll, I do, but it's not the right place to discuss about it. I have the project to start a HVA shotgun thread, but, I long ran out of time for that.
Let me know what you want to know.
Burnt servo,
The only model I can think of made with welded chambers is the 5o Ny Modell (New Model). They are pretty scarce and easy to identify as they have crimp marks all around the barrel and don't have the Greener crossbolt.
Just keep in mind that these guns were made for a MAP pressure of 740 bar (10 700 PSI), a Max Static Pressure of 830 bar (12 038 PSI) and a prof load of 950 bar (13 778 PSI).