You are buying a Sabre Defence Upper Receiver. The Barrel is a Sabre Defence 20" 1/7 5.56 Nato barrel. The receiver is a Sabre Defence upper receiver with the CAT stamp on it. Complete with MATECH rear Sight, P&S quad rails, complete SDI bolt carrier and original stock, buffer, buffer tube, pistol grip and spring. This upper is NEW OLD STOCK. We cut up the machine-gun that this upper was attached while under ATF supervision. The rifle was NIB when we started. Stock has the stub of the receiver still attached. These M16 rifles had US Property markings on the lower receiver. This your chance to get REAL US Property, that is not stolen. Serial number and photo from original lower will be included. CC fee is 3%. PA residents must pay sales tax.