Ballistic Advantage Premium Series Threaded Barrel 6.5mm Grendel II 16in SPR Mid-Length 1-8 Twist 5/8x24 Thread Bead Blasted Stainless Steel. 5 Grendel "Type 2" chambered 16 inch barrel is machined from 416 Stainless Steel with a bead blasted finish. Our Premium Series Barrels feature a Nickel Boron Coated Extended M4 Feed Ramp Extension. Specifications for Ballistic Advantage Premium Series 6.5mm Grendel II SPR Threaded Barrel: Manufacturer: Ballistic Advantage Color: Stainless Steel Finish: Bead Blasted Fabric/Material: 416 Stainless Steel Caliber: 6.5mm Grendel II Barrel Length: 16 in Barrel Profile: SPR Gas System Length: Mid Length Gas Block Journal Size-Diameter: .750 in Threads per Inch: 5/8x24 Barrel Twist Rate: 1-8 Barrel Material: 416 Stainless Steel Flutes: No Gun Make: AR Platform Gun Model: AR-15 Weight: 39.3 oz Country of Origin: USA Package Contents: Ballistic Advantage Premium Series 6.5mm Grendel II SPR Threaded Barrel What firearm models does the manufacturer say Ballistic Advantage Premium Series 6.5mm Grendel II SPR Threaded Barrel is compatible with? The manufacturer says that Ballistic Advantage Premium Series 6.5mm Grendel II SPR Threaded Barrel is compatible with AR-15Ballistic Advantage BABL65G005P: Premium Series Threaded Barrel 6.5mm Grendel II 16in SPR Mid-Length 1-8 Twist 5/8x24 Thread Bead Blasted Stainless Steel