I have just sold an FAS 604 to a chap on here and unfortunately it would not compress. I had tested it and had all the seals changed so was expecting it to work. Obviously this didn't.
I spoke to the chap who repaired it and he told me that he changed the two seals on the valve in the block. I was under the impression there were three seals in the valve assembly, but he suggests there are only 2. Looking on the internet, the pictures suggest 2 but in the detail, three are mentioned. Are there 3 or 2? Speaking to the chap who bought it, it sounds like the leak is on the valve end.
Is there a recommended servicer of these pistols as I dont want to sell it again unless it is 100% as it should be.