Knight's Armament URX 3 includes built in flip up front sight, and 3 rail covers. Rail has 4 rotation limited QD Swivel sockets (front and rear of each side). Installs on most 5.56mm (.223) AR-15 type rifles. Overall length is 12.5 inches and weight in at a light 15.2 oz. with barrel nut and rail covers.
Requires Knight's Armament new style barrel nut wrench #20495 to install.