thats a nice beauty http://www.egun.de/market/item.php?id=6187448

Franz Neuber&Sohn Gewehrfabrik Wiener Neustadt 7x57 with Zeiss Zielvier on claw mount
probably a Steyr M 93 action connected with a Mauser 98 magazine

this rubber ring have an extra lens insideand when you put it on the zielvier you get a 7x scope