Must be your local franchisee. I checked mine - he has one in the same building as my office and he doesn't do anything extra for true gluten-free - as far as CC goes.
I went to the downtown Redmond, WA Fat Burger today and watched them prepare food. I am not Gluten Free, but my wife is. As they were preparing my order, we watched them continuously feed buns into the toaster, without chaning their gloves. I believe their buns can get cross contaminated by the toaster, and the preparers gloves. I also believe they can get cross contaminated by the condiment knives. They fry their onion rings and fries in the same fryer as well. While their buns may be gluten free, cross contamination is a high possibility there.