My Air Match 600 also had a leak - but unfortunately mine was due to a fracture in the main air chamber casting and there are no more of these available.

I was advised by the last known UK importer/distributor for Air Match that this was not uncommon, but he still had one of the few steel pressure cylinder castings that had been made for the special "team issue" pistols and I bought this along with all the other spare parts that he had left as a "job lot".

I enjoyed shooting the pistol and it did have more power than any other SSP type that I have owned.

When I sold the pistol I gave all of the spare parts that I had bought to the new owner.

As long as your leak is not a problem with the pressure cylinder casting, "O" rings should be easy for you to obtain and fit.