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Old May 16, 2012, 11:33 PM   #9
James K
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Join Date: March 17, 1999
Posts: 19,979
If that crud is 7" or so from the muzzle, it might not have anything to do with firing the gun. A gun stored in a closet or some place like that seems attractive to certain kinds of insects which make their nests in the barrel. They can make a real mess that is hard to clean out and can eat away the steel.

Jim
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