This is a nearly new Colt 6721 complete upper. It's been fired less than 50 rounds in order to sight in. It has a 16 inch heavy barrel (HBAR), chrome lined, with a 1/9 twist and an A2 flash hider. Includes original Colt BCG, charging handle and removable A3 carry handle. I bought it new and it's in like new condition. Price is $450 shipped CONUS to localities where it is legal. Payment by USPS Money Order.