The Colt M5 CQC 5.56mm Full Auto Rifle with a 10.3″ barrel is highlighted for its compact design, powerful 5.56mm caliber, full-auto capability, reliability, versatility, and trusted heritage. It offers maneuverability for close-quarters combat, firepower for various distances, and dependable performance in adverse conditions. Overall, it’s considered the best automatic rifle for its balanced features, suitable for military, law enforcement, and civilian use.