I went the same route in collecting WWII era snipers. Its taken me nearly 15 years, but I now have 1 of everything including a K31/43 which was my last acquisition. I've never seen or heard of a repro of this sniper or its sister the K31/42. The scope is built into the receiver on these guns, so its probably harder to try and make a repro than buying a real one.
For some of the other snipers, I started out with repros and gradually replaced what I could with the real deal. I still have several repros that I'll probably never be able to replace, because the cost of original rifles is too great for my budget. My advice is start saving your dollars. Good luck.
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