Milling marks, as we all know, are very common on war-production mosin nagants. My personal rifle is a 1943 Izzy M91/30, and it fires perfectly, perfect condition. That is, except for the hideous mill marks on the receiver. I know these don't affect function, but they are ugly. Is there any way to repair them?
The others have already told you why you may not want to do it, from ahistorical perspective.
You could stone the action smooth with polishing stones. But the time or cost if you paid someone to do it would be more expensive than finding a pre-war or early war example. That also opens the possibility of getting past the heat treated portion if the metal as well. Then refinishing the metal to protect it.
I agree. It adds character. It shows the perserverance of the Russians, with shells flying overhead they still were manufacturing guns. Sometimes running them an armful at a time to the front lines. Character only a WWII vet can show!
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As someone that has done what you are asking about, don't do it unless you have the proper skills, patience and a lot of time to dedicate to it. It was a winter project on a poor example of a Mosin for me. I have an ATI stock that I got for free and I did all the work my self.
I have plenty of time. All I need is an answer: can these be repaired? If so, then how do I go about it?
Polishing stones from Brownells. It will take a lot of elbow grease and time. Then you get to refinish it. If you are going tactical, then you could also look into having the whole exterior sand blasted, then have a baked on coating applied. There are some that will also help cover small blemishes.
I used files on the bad ones, mostly jewlers files. Lots of time. I worked on it for a few months. Took off the rear sight and filed and filled in. Took a few inches off the barrel. Filed out the milling marks in the barrel. Oh heck, here's a pic.