So my 'new to me' Hammerli Master is a very nice and accurate pistol - but only when I can keep gas in it!

Its all to do with the automatic release device. Sometimes when a new capsule is loaded it closes and stays shut for a shortish while, sometimes it just steadily releases gas and sometimes it just releases all the gas in one go.

Unfortunately, I don't really understand how the valve works. The only information and parts diagrams in the public domain , on Vintage Airguns, are for an earlier pistol and the instructions don't appear to be valid for this model.

Any knowledge on these pistols gratefully received!

Steve