The present disclosure is directed to a barrel comprising cast metal, composite or plastic for use in a bat assembly; a bat assembly comprising a barrel portion, an end cap and a handle; and a ball bat. The barrel may have uniform wall thickness or may include structural elements disposed on an inner surface to improve stiffness and reduce weight. The barrel and bat may further comprise a weighted insert for an asymmetrical center of gravity, allowing controlled spin to be imparted on a struck ball based on the angular orientation of the bat.