They were out of buns when I ordered but I assume they normally have them. So instead I got my burger in a lettuce wrap, told them I'm gluten free and felt fine afterwards.
They also told me the fries aren't gluten free, which I'm not sure is true from other Smashburger locations. But, I'm glad they err on the safe side (so, I didn't have fries).
— Somewhat
— Gluten-free items are marked on the main menu
— Some
— Average