The metal on the bottom of the shell lifter is just brass rubbed off the shells they loaded the gun with to test fire it. Should rub off with some gun oil and a little elbow grease. But its going to do that every time you load it--the brass they plate the base metal on shells with is pretty crappy.
The lead streaking in the barrel is normal--usually from slugs. I suppose they test fire the gun with shot and slugs--don't know. But when you shoot some slugs through it the result will be the same. It comes out with a brush and a good bore solvent.
Can't speak to the marks on the receiver. The adhesive marks from the sticker would come off with a little alcohol on a soft cloth or something like "goo be gone" I would guess.
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Last edited by Big Bird; 10-15-2012 at 06:02..