New Disc Extreme Barrel Question

[shguns]

I have a new Disc Extreme barrel. The interior/bore of the barrel is really dark black.
Is this a coating or just left over from manufacturing the barrel at Green Mountain?
Does it need to be completely cleaned out of the bore before shooting it?
I have swabbed it with patches and bore solvent and it is smooth but still really black.
Thanks,
Scott

[sourdough44]

Black would be fine with me. I just don't want to see any rust. Just clean it with Hoppes 9 or similar, then dry before loading & shoot. Clean afterwards of course.