I think it must be one of the Eickhorn products then, I still don't regard them as a "Fake" as they were used but not by the US... Eikhorn made the M7 as sell and the difference was the grip was a formed tube that slid over the tang and was retained by a stainless Phillips screw through the butt. It hung in our rifle company office on a plaque for years until our Battalion moved. It was like your M6 for looks.