DealReceivers: Aero Precision X15 7075-T6 Aluminum AR-15 Upper & Lower Receiver Set - Type III Class II Hard Coat Anodized - Black. Barrel: 8.5 Modern Profile 4150 CrMoV Barrel, Black Nitride Finish, 300 Blackout Chambered, 1:8 Twist. from Ground Zero Precision (Product X15300B-8.5) |