The Ballistic Advantage Modern Series AR-15 barrel is combines the durability and strength of 41V50 chrome moly vanadium steel with the exceptionally corrosion resistant QPQ treatment. This provides not only an impressive barrel life but ensures excellent accuracy and an affordable price. Every Ballistic Advantage barrel is guaranteed to give sub Minute of Angle accuracy with match grade ammunition. This 16" pencil contour barrel is chambered for 5.56 NATO ammunition and is ready to accept your favorite ..625" gas blocks.