Hi Raimey and Jani
The RZ is clear and unmistakable in fact it is the clearest marks on the barrels. There are no other marks that I can find except the number 31 on the tubes. There are no screws coming down thru the long top tang only one coming from below, I will try to take a better pic of that area. Thanks so much for your input your knowledge and speculation on the German Guns is very impressive. Jani agreed not a high grade gun but also I did not feel that the general finishing of the metal was as good as most German guns, but still neat, look at the long triangular metal part that activates the extractors.
Jeff
