FX Independence loses pressure

Hi y'all!

I have an FX Independence shrouded version in .22. For some time now, it loses pressure, after 24 hours the gauge goes down from 200 to 150 bar, and eventually all pressure is lost. I have checked the fill probe (replaced o-ring inside it, used teflon tape on the thread, cleaned it, but without results. Are there any other parts that might cause leakage that you guys know of?

Thanks!
 
"metal rings between the foster fitting and the breech" cant see your part ( have a picture?) but you seem to be describing the Dowty washer, like a metal washer with a seal pressed inside it. You can find a new one at a good hardware or certainly at a hydraulic warehouse type place.
A drop of Dawn soap mixed with a few drops of water applied with a q-tip should show your leak,.
And please give us the updated fix when you get it done.

John