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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...