What is the best gun for bird hunting?

a rifle.Please ignore the previous answer.The best firearm for hunting game birds is a shotgun.They come in single shots,pump action,semi-auto,over under,and side by side configuration.You will have to decide which fits you best.most upland birds are hunted with a 20 gauge,while most bigger birds including pheasent,and geese will best be served by a 12 gauge shotgun.