Colt's LE6920MPS-B shares many features of its combat-proven brother, the Colt M4. The heart of this 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 SL handguards, MOE SL carbine stock, MOE SL pistol grip, MOE vertical grip and a Magpul Back-up Sight all come as standard equipment on this exceptional carbine.