I love Five Guys! No, they don't have a GF bun but the burger in a lettuce wrap is so delicious that I don't miss the bun at all. They have a separate grill for the buns so the burgers will not have CC and as long as you let them know you have celiac or are intolerant they will change gloves and take precautions. They also have a dedicated fryer so the fries are safe too! Yummm!