He sent me this:
If it was me I wouldn’t worry about it, a gunsmith should cold blue it for next to nothing, if not free, it would take them 1 minute of time. If you really want you can send the pistol in we would probably replace it with a new one, or if you would be satisfied we could cold blue it for you. Up to you, its pretty minor though.
I'll probably send it in later if I'm still annoyed, provided they don't want me to pay for shipping. I don't mind not having it for a while since I don't shoot often. We'll see though; doubt I'll do anything.