Your barrel is on straight, a rarity these days. It shoots fine. Keep it, carry it and shoot it. No ruger double action ever won a beauty contest (including all five of mine). Fuggetaboutit and carry on...
+1
Put it in a holster, shoot it, carry it, and before you know it that tiny cosmetic blemish will be forgotten. Besides, even if they replaced it, you'd most likely just find some other cosmetic blemish on the new gun. I have two SP revolvers, both purchased within the last couple of years. I also had a third that I got rid of a few years before that. Of those three, two were less than perfect cosmetically. The third, well give me enough time, and I'm sure I can find something. They all three functioned flawlessly, and honestly, none were likely to win a beauty contest, blemishes or not.