AR57 ULT Upper Assembly 5.7×28

AR57 Ultra Light Tactical Upper Assembly 5.7x28mm; 16″ Barrel – 1:9 Twist Rate – Black Melonite Finish; Forged from 1 7075 T6 Monobloc Aluminum; 8620 Steel Alloy Bolt Carrier Buffer Tube & Flashider – Black Meonite Treatment Finish