JG Airguns

He still has the parts, but doesn't rebuild them anymore (he did at one time). He can supply the parts if needed. Pehaps I missunderstood him...was lucky in that that last rifle only needed the button and it's seal (and the piston seal..and a release valve). Do have the seals needed for that internal piston, and if I ever have to go in there, will let you know what's inside. Once the other seals swere replaced, the little rifle clocked 603fps, which i figure is a pretty good indication i didn't need to open it up and do any more seal work.

For a match gun, it's really not a bad one to take apart and (more important) get back together right, but as i've not seen instuctions, you'll just have to think it out for yourself.

There is some dead space as the central "button" is aboput 1/2 the diameter of the cylinder, but i do belive your description is the way it is supose to work.