This brought up a flag for me!!!!
I read this, and read the post on the link. I had the same problem a week or so ago. (You can read my post "Rust removal on SS" in the TC handguns forum).
Stainless frame owned for about 3 months, has had around 50 shots through it (centerfire/smokeless), hunted with 3 times (no rain), cleaned after every shooting session, and every hunt. This is my first stainless gun and I'm not impressed. I clean and wipe down all my guns carefully. I've hunted with blued guns and muzzleloaders in all kinds of weather, always cleaned them carefully, and I've never had any rust on them. I cared for this stainless gun in the same way, cleaning and oil, but a few very light spots of surface rust showed on the frame. These spots could barely be seen, and were on the frame only.
I'm not happy with TC's SS. To be truthful I'm very disappointed. In my opinion, I've recieved a SS product at a higher price that under the same care has not performed as well as a blued gun at a lower price.
On a positive note, fine steel wool and oil removed the spots very quickly. I hope the future is better for my SS.