DEMO Ballistic Advantage Performance Barrel AR-15 5.56 12.9in Hanson Contour 1/7 Twist 1/2x28 Thread QPQ Corrosion Resistant Black. 56 Barrel. These Rifle Barrels by Ballistic Advantage are constructed from tough 4150 Chrome Moly Vanadium steel with a quart barrel gas system to handle heavier loads with ease. For superior longevity the Ballistic Advantage Hanson Series Barrel is coated with a nickel boron mixed finish while also containing QPQ Corrosion Resistant coating ensuring this device doesn't succumb to erosion over time. A QPQ corrosion resistant coating also prevents abrasion and damage to the barrel and a machined gas port provides tighter tolerances for precise shooting. Install a Ballistic Advantage Hanson Series Rifle Barrel to upgrade your gun with premium gear. Specifications for Ballistic Advantage Performance 5.56 Barrel: Manufacturer: Ballistic Advantage Color: Black Finish: QPQ Corrosion Resistant Fabric/Material: 4150 Chrome Moly Vanadium Barrel Profile: Hanson Gas Block Journal Size-Diameter: .750 in Barrel Twist Rate: 1-7 Barrel Material: 4150 Chrome Moly Vanadium Gun Make: AR Platform Gun Model: AR-15 Firearms Threads Per Inch: 1/2x28 Country of Origin: USA Package Contents: Ballistic Advantage Performance 5.56 Barrel What firearm models does the manufacturer say Ballistic Advantage Performance 5.56 Barrel is compatible with? The manufacturer says that Ballistic Advantage Performance 5.56 Barrel is compatible with AR-15Ballistic Advantage BABL556033F: Performance Barrel AR-15 5.56 12.9in Hanson Contour 1/7 Twist 1/2x28 Thread QPQ Corrosion Resistant Black