"Waldläufer" is a sometimes mythical and rare Driling version where a 22 lr barrel is on top of two shotgun barrels. its not common that such a drilling will be on the market like here
http://www.egun.de/market/item.php?id=3386415
again excellent work from Schmidt & Habermann in Suhl. the 22 Mag. was not original of course! this was a 22lr but after the war someone decided that the old 22 lang für Büchse wasnt enough anymore.
"Waldläufer" is an old german word meaning French Canadian woodsman, the Coureurs des bois
http://en.wikipedia.org/wiki/Coureur_des_bois