Here's an example of an inclusion as Dean mentioned. This is an 1895 Ithaca Crass with damascus barrels that were being cleaned up for reblueing. Initially just a small pit on the surface of the barrels, quickly grew into what you see here as polishing continued. Inside the barrels are bright and smooth,giving no indication of a fault. My guess is a piece of slag or a metal chip was hammered right into the tube as it was made at the forge.Before discovering this fault, I personally fired several hundred rounds throught this gun without a problem.
The inclusion is 5 inches from the muzzle of 30 inch barrels.
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 "Double guns are a sport and a pastime built into a beautiful package to which I attach myself when entering the great theater of autumn, those days now grow more precious because we are given so few".. Robin Lacy
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