Colt Model LE6940 Advanced Monolithic Carbine M4 5.56mm 16.1 Inch Barrel Full Length Rail System Flip Up Rear Sight Collapsible Stock 20 Round

Features include one-piece monolithic upper receiver with full length rail, Mil-Spec rails, removable lower rail. Free floated barrel is hard-chrome lined, 6 grooves with 1:7 inch right hand twist. Direct gas system; locking bolt. Flip-up adjustable front and rear sights. Bayonet lug and A2 flash suppressor. Collapsible stock. 20-round magazine capacity.