Unless it's actually pitting, a phosphor bronze brush, wrapped with bronze wool and wetted with light oil should remove it.
Since the A3 is a WW2 riflke, 0000 steel wool should also be safe.
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The soldier's pack is not so heavy a burden as the prisoner's chains. Dwight Eisenhower
It is very important what a man stands for.
But it is far more important what a man refuses to stand for.
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