This is a Berlin-Lubecker (duv code) G.41.  The serial number is 1774h, right at the end of production.  I feel this is an experimental rifle that was an attempt to satisfy the need for a rifle with a high capacity magazine for fortress protection by static troops.  

The gun is mostly matching with some unnumbered parts and the trigger guard group is numbered 1704.  The magazine is a MG13 magazine dated K (1934) and waffenamt stamped with period numbers.   It is not removeable.   It is also stamped S/42 which makes it a Mauser replacement magazine.  So that ties in with the possibility of this being a late parts assembled rifle.  

You can see in the pictures of the magazine how the feed area of the frame was slightly modified apparently to improve feeding characteristics.

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Stock & Magazine Pictures