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Derek. even though titled 223, the barrel is actually stamped 5.56NATO so it will handle both 556 and 223 without issue.

It can shoot both 5.56 and .223 rem. Info from: https://www.tombstonetactical.com/catalog/fnh/36301-fn15-sporting-ar15-rifle-5.56mm-18in-30rd-black/ . And also https://www.hyattgunstore.com/fn-fn-15-sporting-ar-15-223-5.56-rifle.html

it will be fine with either 223 or 5.56 ammo (5.56 can use 223 but a 223 rifle can not use 5.56)