Ballistic Advantage Premium Series, SPR Profile Barrel, 6.5 Grendel, Fits AR15, 18 Threaded Barrel, 5/8x24 Thread Pitch, 1:8 Barrel Twist, Rifle Length Gas System, Bead Blasted Stainless Steel, Silver BABL65G003P This 6.5 Grendel Type 2 chambered 18 inch barrel is machined from 416 Stainless Steel with a bead blasted finish. The Premium Series Barrels feature a Nickel Boron Coated Extended M4 Feed Ramp Extension.