Clear pictures of the numbers and markings on your bolt would be interesting.
  It appears your barrel has the small 'swastika' marking of a Norwegian steel or barrel producer.  This marking is common on early Norwegian Krag barrels and has nothing to do with the Nazis.
  There are a couple of filled screw-holes in the groove on the left side of your receiver.  It appears a scope was once mounted on this 'sporterized' Krag.

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