.223 caliber, 16" barrel, S/N 030741. Colt M4 upper to include 1/7 twist government profile barrel, Colt C marked bolt carrier group, and Colt upper receiver. On the left side of the lower receiver is the Colt logo, Colt horse, model, caliber, and serial number. The right side of the upper receiver is marked with a Colt “C” and the Alcoa Forge “AF.” Accessories include Knights Armament M4 RAS quad rail and grip panels, GG&G vertical grip, Harris 1A2 bipod, Insight Technologies PEQ-2 IR laser/illuminator, and a Trijicon TA31RCO 4x32 optic. Overall, this rifle is in good used condition with minor wear marks in and around the magazine well. There is no muzzle device.