Throughout the world today, Colt's reliability, performance, and accuracy provide our Armed Forces the confidence required to accomplish any mission. Colt's top-of-the-line semi-automatic Carbines share many features of their combat-proven brother, the Colt M4. The heart of these new carbines are their 16.1" chrome-lined barrel. With a 1 in 7" twist, ammunition selection is virtually unlimited. In addition, Colt teamed up with Magpul Industries to outfit these carbines with the most highly sought after accessories. Magpul MOE handguards, a MOE carbine stock, a MOE pistol grip, a MOE vertical grip, and a Magpul Back-up sight all come as standard equipment on these exceptional carbines. The CMPB model is California approved. 9 + 1 capacity.