TacFire BAR9MM16BN AR Barrel 9mm NATO 16″ Black Nitride Finish 4150 Chrome Moly Vanadium Steel Material with Threading & 1:10″ Twist for AR-15
Diamondback 556C16MF50B8R DB Barrel (M4 Contour) 5.56x45mm NATO 16″ Black Nitride 4150 Chrome Moly Vanadium Steel