Ballistic Advantage Premium Series 22 ARC Threaded Barrel 22in Bull Rifle Plus 1 1-7 1/2x28 Threaded QPQ Black. BA Premium Series Barrels feature a Nickel Boron Coated Extended M4 Feed Ramp Extension. BA Fluted barrels deliver the perfect balance of weight and rigidity. Utilizing six and eight flute designs weve achieved weight reduction up to and exceeding 16 ounces. Confidently lighten your kit without sacrificing an ounce of accuracy. Specifications for Ballistic Advantage Premium Series 22 ARC Threaded Barrel: Manufacturer: Ballistic Advantage Caliber: .22 ARC (Advanced Rifle Cartridge) Threads per Inch: 1/2x28 Barrel Twist Rate: 1-7 Barrel Material: 416R Stainless Steel Gun Make: AR Platform Gun Model: AR-15 Package Contents: Ballistic Advantage Premium Series 22 ARC Threaded Barrel What firearm models does the manufacturer say Ballistic Advantage Premium Series 22 ARC Threaded Barrel is compatible with? The manufacturer suggests that Ballistic Advantage Premium Series 22 ARC Threaded Barrel is compatible with AR-15Ballistic Advantage BABL22ARC04PQ: Premium Series 22 ARC Threaded Barrel 22in Bull Rifle Plus 1 1-7 1/2x28 Threaded QPQ Black