NIB. Colt M4 Carbine 1 in 7″ twist. chambered in .223 rem / 5.56×45 Nato. Magpul upgrades. Black finish with black accessories. Ships with original box serialized to the gun, manual and accessories. S/N: LE322468 At the base of this new AR platform rifle is Colt’s popular 6920 Law Enforcement Carbine, proven to be effectively mobile during tactical deployment and traditional patrol. With its 16.1” chrome lined barrel and 1 in 7” twist, ammunition selection is virtually unlimited. This rifle is the first product Colt Defense and Magpul have developed together. Both companies have teamed up 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.