Buffalo Wild Wings is notoriously anti-gun. They are all posted here in VA. A friend of mine was recently seated and served food, once the food arrived the manager came over and asked him to put it in the car. He missed the tiny sign they had at the front door. Worst part is that he had already been there for 30 minutes without a problem. They might have good food but they won't get my business. I don't think they will be changing their policy any time soon.
Just a side note, I try to never tell a business that they should post signs. If they do, it eliminates the option to conceal carry if you absolutely have to go there.