Fine looking view of the bolt rifle NIMRODWERKE- great job of machining indeed, typical of both German and Austrian weapons mfg. prior to 1939-- Nicht Fur Kugel means- Not for Ball ammo- or- birdshot loads only (sorry, my Dell keyboard can't put the umlat over the u in the word Fur-- Krieg is the German word for War- and Kriegen is the plural of that word. I am just as curious as you seem to be about its true meaning as a barrel stamping as shown in your fotos- Auf Weidenschoen!

"The field is the touchstone of the man"..