Thanks for the reply's this is driving me up the wall. Nobody seems to know what way they are meant to be and to make it worse it looks like it has two valves with belleville washers on them! Is this std or a custom mod?
On a good note I have some o rings coming tomorrow but not from an air rifle company but from a bearing manufacturer.
So many phone calls to dealers today have got me no where
I think the only way is to strip another ar20ft and have a look.
Some one must know............
If I had hair I would have pulled it out today