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I got a 1999 Ruger #1V 223 in 2007 for $500 mail order that had that much Copper fouling.
I cleaned out the copper and shot (6) groups.

The Ruger is good for a factory rifle.

There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. -Ernest Hemingway
The man who makes no mistakes does not usually make anything.-- Edward John Phelps