I get these in on a weekly basis to change the original poor quality seals with decent polyurethane type. The main seals are actually the same size as used on the end cap of the Crosman 600 which I keep a stock of. I bought some spares off a guy on here which included an HPA air conversion cap for the cylinder, so will try this on the QB to see what results are obtainable, (number of shots etc). I have a regulated HPA bottle which makes it a lot safer.
Baz
BE AN INDEPENDENT THINKER, DON'T FOLLOW THE CROWD