I have a brand new Sharps bros The Jack AR-15. It has a Aero Precision M4E1 AR-15 16in 5.56 Mid Barrel Complete Upper Receiver with a Aero Precision AR15 5.56mm Bolt Carrier Group (Nickel Boron), CMC Flat Rifle Single Stage Drop-in 3.5-pound Trigger, primary arms red dot, magpul stock and front grip..