this is a M 98 in 8x33 kurz, made in 2006 by cut 24,6mm out of a mauser action

http://www.egun.de/market/item.php?id=3244681

oal of the rifle is 98 cm and the action looks absolutly clean. I remember seeing such work only for 22lr conversions before. how are the parts welded together, what for a method?