Ballistic Advantage Performance Series 5.56 AR Rifle Barrels. 56 AR Rifle Barrels. These AR15 Barrels by Ballistic Advantage are machined from 4150 Chrome Moly Vanadium Steel to withstand the power of your rifle and deliver repeatable results that will nail targets with precision with every trigger pull. For enhanced durability and longevity these Ballistic Advantage 5.56 Performance Series Rifle Barrels contain a QPQ corrosion resistant finish as well as a nickel boron coated M4 feed ramp extension. Each of these top-of-the-line barrels are HP and MPI tested to ensure their quality and performance. With several different gas systems and sizes you'll be sure to find a barrel that will fit your rifle and deliver premium results. Pick up on of these Ballistic Advantage 5.56 Performance Series AR Barrels today and upgrade your favorite firearm. Specifications for Ballistic Advantage Performance Series 5.56 AR Rifle Barrels: Manufacturer: Ballistic Advantage Caliber: 5.56x45mm NATO Barrel Twist Rate: 1-7 Gun Make: AR Platform Features of Ballistic Advantage Performance Series 5.56 AR Rifle Barrels: Machined from 4150 Chrome Moly Vanadium Steel QPQ Corrosion Resistant Finish Nickel Boron Coated M4 Feed Ramp Extension HP and MPI tested Package Contents: Ballistic Advantage Performance Series 5.56 AR Rifle Barrels