This is a good topic and one which I wish to add to.
Always, always strip and clean ANY new firearm.
When I got a Remington Peerless shotgun a few years back I striped and cleaned it over a auto type oil pan. The pan was black plastic. After I sprayed everything down into the pan if you moved the pan around as if you were panning for gold there were a LOT of metal flecks in the solvent. The metal flecks were numerous(thousands) and easily seen. Never assume that anything that is new or factory fresh is really clean. You don't want to break in any mechanical device with crud from manufacturing left inside it. Another way to see what comes off is to clean over a white towel. Everything shows up. You would be suprised, I sure have been with more than one firearm that was straight from the factory.
Mike