Andrew,
The gun does not have a blued barrel. I have discussed this with some very advanced collectors and they are of the opinion that the KM marked guns in the A prefix range may not have blued barrels as 100% correct. I saw a second "A" prefix KM marked gun at NGD without the blued barrel and that gun was also 100% correct.
A closeup look at the KM marking shows that this marking is genuine. Here is a comparison of a fake KM marking on a Radom and two real KM markings, one on a Mauser 1934 and one from the KM marked Radom pictured above.
Mark
