Ballistic Advantage ARC Threaded Barrel 6mm 20in DMR Rifle 1-7 Twist 5/8x24 Threaded QPQ Corrosion Resistant Black. Specifications for Ballistic Advantage Premium Series 6mm ARC Threaded Barrel: Manufacturer: Ballistic Advantage Fabric/Material: 416 Stainless Steel Caliber: 6mm ARC Gas Block Journal Size-Diameter: .750 in Threads per Inch: 5/8x24 Barrel Twist Rate: 1-7 Barrel Material: 416 Stainless Steel Gun Make: AR Platform Gun Model: AR-15 Condition: New Package Contents: Ballistic Advantage Premium Series 6mm ARC Threaded Barrel What firearm models does the manufacturer say Ballistic Advantage Premium Series 6mm ARC Threaded Barrel is compatible with? The manufacturer says that Ballistic Advantage Premium Series 6mm ARC Threaded Barrel is compatible with AR-15Ballistic Advantage BABL6MM003PQ: ARC Threaded Barrel 6mm 20in DMR Rifle 1-7 Twist 5/8x24 Threaded QPQ Corrosion Resistant Black