Ballistic Advantage Modern Barrel AR-15 .300 6in DPR Contour 1/7 Twist 5/8x24 Thread QPQ Corrosion Resistant Black. Ballistic Advantage built these Rifle Barrels with a 1:7 twist rate and QPQ corrosion resistant finish that hold up in any environment. The Ballistic Advantage Modern Series QPQ Coated Rifle Barrel is made from chrome moly vanadium steel for added toughness at a lighter weight and these barrels are corrosion resistant so that you can use them in the harshest environments. Improve your weapon's function and precision by installing a Ballistic Advantage Modern Series .300 AAC Blackout Rifle Barrel. Specifications for Ballistic Advantage Modern Series .300 AR Rifle Barrel: Manufacturer: Ballistic Advantage Color: Black Finish: QPQ Corrosion Resistant Fabric/Material: 4150 Chrome Moly Vanadium Caliber: .300 AAC Blackout Barrel Profile: DRP Gas System Length: Pistol Length Gas Block Journal Size-Diameter: .750 in Threads per Inch: 5/8x24 Barrel Material: 4150 Chrome Moly Vanadium Gun Make: AR Platform Gun Model: AR-15 Country of Origin: USA Features of Ballistic Advantage Modern Series .300 AR Rifle Barrel: Material: 4150 Chrome Moly Vanadium QPQ Corrosion Resistant Finish QPQ coated M4 feed ramp extension Package Contents: Ballistic Advantage Modern Series .300 AR Rifle Barrel What firearm models does the manufacturer say Ballistic Advantage Modern Series .300 AR Rifle Barrel is compatible with? The manufacturer says that Ballistic Advantage Modern Series .300 AR Rifle Barrel is compatible with AR-15 M4Ballistic Advantage BABL300013M: Modern Barrel AR-15 .300 6in DPR Contour 1/7 Twist 5/8x24 Thread QPQ Corrosion Resistant Black