I just bought a ANIB pistol (Beretta 92FS) and haven't fired it yet. When I bought this pistol, although the outside looked brand new, it was apparent that it had been shot a little. After checking the pistol to make sure that it was unloaded, I disassembled it. BTW, the Beretta is sooooo easy to field strip for cleaning. It looks like it had been fired right out of the box before the barrel had been cleaned. This left a lot of crud imbedded in the bore. After a lot of Hoppe's Elite, clean patches, a little JB Bore Compound, a lot of Kroil, more Hoppe's Elite, a fairly new bronze bore brush and more clean patches, the bore is pretty clean now. I also cleaned the grease (who thought of putting grease on semi-auto pistol rails?) off and oiled the gun with FP-10. The action now operates smoothly and the trigger is noticeably smoother as well.
I always clean a new gun, even one new from the factory. It gives me the peace of mind that there aren't some small metal filings somewhere. Cleaning the bore properly seems to make it foul less and make subsequent cleaning easier. Oh, I always have to check for pieces of the bore brushes. It looks like they don't make them like they used to and small pieces can break off and get in places that they shouldn't be. This could really be a concern for a gun that you keep for self-defense.
I always clean a new gun, even one new from the factory. It gives me the peace of mind that there aren't some small metal filings somewhere. Cleaning the bore properly seems to make it foul less and make subsequent cleaning easier. Oh, I always have to check for pieces of the bore brushes. It looks like they don't make them like they used to and small pieces can break off and get in places that they shouldn't be. This could really be a concern for a gun that you keep for self-defense.