Understanding Firearm Cleaning and Preservation
Eye Balling, The Barrel Inspection
62. Check for rust pits, oil rings, hornet nests, stuck patches, stuck pull-throughs, copper fouling, lead fouling, little fury animals, lumps of copper from gilding material, or lumps of plastic from shotgun wads or just plain dirt.
Hold the firearm or barrel with the breech end near a light source sunlight or a fluoro-light holding the muzzle six inches or so from your eye, move the barrel backwards and forwards, nearer and further from your eye so that you get a good picture of the surface of the inside of the barrel. Do not just see the bright light through it and consider that its good enough, looking through the barrel is easy you have to look into the barrel, look into the walls of the barrel, try and look into the pores of the barrel, look at …