No name is known as well as Colt when it comes to reliability, accuracy, and performance in an AR. For years, The United States Armed Forces have put their confidence in the Colt to help them accomplish any mission. The Colt Expanse M4 Carbine rifle brings the same quality and craftsmanship of its combat bred brethren for a fantastic price. Its 16.1” 1/7 twist barrel can handle a wide variety of ammunition and stabilize popular heavy loads. A dust cover and forward assist can easily be added. Like its combat proven brethren, the Colt Expanse M4 includes the durable and adjustable post A2 front sight.