The new Colt LE6920MPS-B shares many features of its combat proven brother that we are all familiar with, the Colt M4 Carbine. This new carbine features a slick 16.1 chrome lined barrel. With a 1 in 7 twist, you can choose your favorite ammunition without limitation. Colt teamed up with Magpul Industries to outfit this carbine with the most highly sought after accessories, including Magpul's MOE SL handguards, MOE SL carbine stock, MOE SL pistol grip, MOE vertical grip and a Magpul Back-up Sight - all of which come as standard equipment on this exceptional carbine. The American Made Colt AR-15 is combat tested and will be a reliable long rifle to add to your collection.