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according to the springfield armory website it will shoot booth .223 and 5.56 https://www.springfield-armory.com/products/saint/

It is a 5.56 gun that can also shoot .223 springfield-armory.com/products/saint/

Lennie, the Barrel is stamped 5.56NATO so it will shoot either 5.56 or .223 Ammunition without issue.

Lennie -this Springfield Saint is "Bi" ... Bi-caliber! Shoots either 5.56 or .223.