Something I forgot to mention, it's a good idea to "ring" the barrels. Remove the barrels from the receiver and carefully hang them with a strong cord. I usually tie one end of the cord around the extractors and suspend the tubes by holding the free end of the cord. Take a brass hammer and LIGHTLY tap each tube, they should ring like good wind chimes. If on the other hand the sound is dull it might indicate corrosion under the ribs and should be checked by a professional. A customer once brought me a nice Ithaca double that he was unable to clean a spot out of one of the tubes, on checking I found that the barrel had rusted through from under the rib and there was a hole about 6" in front of the chamber and this was on a steel barrel. The gun otherwise looked fine but responded to the hammer tap like a piece of lead.
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