So I guess the question would be how much has the gun been shot?
MG-42 type firearms have very high rate of fire which can cause much more than average barrel wear. They also have a quick change barrel which solves the problem of barrel wear effectively.
The thing that is different with machine guns is accuracy is a relative term. The point of an MG is to have dispersion and not pin point accuracy.
You could shoot a machine gun till the rifling was totally worn out and it would still function though the bullets would lose a lot of energy due to the gas passing around them.
Chromium helps slow down wear and corrosion. But repairing a shot out barrel isn't really an option. Other parts can also wear out but the MG-42 parts wise is pretty reliable. That being said heat can damage anything specifically extractor claw and springs.
I guess I am not really sure what you want to know.
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