AR57 ULT UPPER ASSEMBLY 12″ BBL 5.7X28

AR57 Ultra Light Tactical Upper Assembly 5.7x28mm; 12" 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