I agree with David, it would be in the sauce or breading on the wings....
Traditional wings would be GF since they are not breaded but this link has information on the sauces. https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.buffalowildwings.com/globalassets/pdfs/nutrition-and-allergen-guide-2018-zone1-lent-bdubs-express.pdf&ved=2ahUKEwiUzNKiguHlAhXHJzQIHXJIAugQFjAAegQIARAB&usg=AOvVaw1TkRVi6kYhos2p7XGS_nTV
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