I noticed that if I apply pressure anywhere on the barrel that the valve will leak down the barrel, but as soon as I don't touch it, the leak stops. The barrel does seem to wobble a fair bit, this is most likely due to the Noxx twistlock-to-cocker adapter I am using.
I've tried with a Dye SS barrel and still got the leak, although not as loud as the leak produced with the Noxx adapter.
I've tried tightening the frame screw, but I didn't see any significant changes. What could be causing this?