I did one of these for a feature in Airgunner magazine and I think it was published sometime in 2015. There are two types of main piston seal. They are both for 30mm diameter compression tubes, but one has a 22mm internal diameter and the other has a 24mm internal diameter and they are not interchangeable. These seals are very rare, if not now impossible to source, as are the firing valves and seals. They are fairly simple to strip, but as I have said, getting hold of spares will be your main problem.


Neil