I've got a unfired colt LE 6721 upper up for grabs. Taken from colts site: The 16.1" (40.9 cm) heavy barrel with 1 in 9" (229 mm) rifling twist allows flexibility in ammunition selection. In position the removable carrying handle provides an M16A4 target style sight adjustable for windage and elevation to 600 meters. Easily removable, the flat top upper receiver allows for easy mounting of optical, night vision and other tactical sighting systems. The tactical carbine is the answer to all the requirements of modern law enforcement. 1:9 16.1" hbar barrel. Includes the BCG, charging handle, and carry handle. Pics upon request. $850 shipped. firm, no trades.