I emailed the warranty department. The warranty guy is pretty cool. So far he says it shouldn't be there, but it's not a big deal and if I go to a gunsmith I should get a drop of blue on that spot and it won't rust (especially since its under the safety).
I told him I'd rather not do that because I'm nowhere near a gunsmith and I don't want to spend more money than I have, and that if he thinks I should send it in I will. We'll see what happens next.