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This is what Hatsan USA told me: The factory has removed this o-ring from all new QE model guns as it is a functionless part. There is no need to seal the nut like that since air actually needs to travel past the nut to escape through the vent in the shroud. Regards, Hatsan USA Service Team...

The part number in question is the 2945. It is an aluminum nut that goes on the end of the barrel. It takes a 14mm socket on the muzzle end. It has holes that pass from front to back to the on the outside of the hex portion and a groove around the outer edge that does fit the o-ring I have...

I have four Hatsan rifles (2-BT65 and 2-Flashpup) with QE systems and not one of them has had an o-ring on the barrel nut when I got them. I have see references on- line that the barrel nut seal should be an o-ring that is C.S. 2.5mm X I.D. 15mm. Does any one know why they are not putting them...

FedEx delivered my Avenger 25 no problem. The problem was it didn't have any air in the cylinder. With bleed screw snug it leaked slowly down after filling twice. I sent it back to PA and am waiting for a new one. I suggest you save all the boxes and packaging until you know it works right. ...