.45 Colt . Actually rather than a Uberti I would buy him one of the Ruger Flattop's in .44 Special or .45 Colt . It will cost more but is more versatile and stronger. If just scooting Cowboy Action one of the New Vaquero's would be my choice. Uberti's are good guns but they are not great guns as a rule and the several I own have been gutted and the parts replaced with ones made of better material.
