The shell rim ring etched into the breech face is quite severe, and puzzling.
Obviously, it was caused by a shell, but how? Was a shell left in the right barrel for a long time? Was there some interaction of the corrosive primer material and the brass head of the shell. This is a reach, but was the gun left leaning against any electrical component? I say this because it appears as though there was some galvanic action taking place. Can you see why old engineers are so anal?
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