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I'll expand on what Gizmo said: search for "Hatsan QE 1/2 x 20 Adapter", they're all over the place on google.

I have come across similar issues with my Hatsan factor (The UK version) and tracked those to a manufacturing issue with part 5951 in that parts list shown in the post here. There is a hole drilled through from the base and while the holes were plugged, they left razor sharp edges near the front...