I sent the picture's shown in this thread of the unique scope mount to fit the 600 series Feinwerkbau rifles to Sports Match by email and had a reply to say " we make this mount".

Fantastic I thought, and immeadiately replied with my thanks for identifying it and asked if I could buy a set please?

No reply !!!!

Maybe Sports Match did not make them after all and I called their bluff by saying I would buy them !!

......or maybe they just don't have any left and no longer have the drawings to make any - but a reply would have been nice !