Colt Defense CR6920MPS-B: Colt's all-new MPS-B series of rifles shares many features of its battlefield-proven brother. The heart of this new carbine is its 16" chrome-lined barrel that is incredibly accurate and capable of sustained fire rates. With a 1:7\" twist, ammunition selection is virtually unlimited. Colt has also teamed up with Magpul to outfit this carbine with the most highly sought-after accessories making sure this is not a \"bare-bones\" rifle. Magpul MOE SL handguards, MOE SL carbine stock, MOE SL pistol grip, MOE vertical grip, and Magpul backup sights all come as standard equipment on this exceptional rifle. The Colt MPS-B Magpul Series is the quickest way to get the customized rifle you want at an exceptional price point.