Throughout the world today Colts reliability performance and accuracy provide our Armed Forces the confidence required to accomplish any mission. Colts shares many features of its combat proven brother the Colt M4. The heart of this new carbine is its 16.1 chrome lined barrel. With a 1 in 7 twist ammunition selection is virtually unlimited. Colt teamed up with Magpul Industries to outfit this carbine with the most highly sought after accessories. Magpul MOE handguards MOE carbine stock MOE pistol grip MOE vertical grip and a Magpul Back-up Sight all come as standard equipment on this exceptional carbine.