Ballistic Advantage Premium Series SPR Barrel Features The Ballistic Advantage Premium Series SPR Barrel is machined from hardened 416R stainless steel a material chosen for its wear resistance and ability to hold a precise chamber over extended use. Its SPR profile strikes a balance between weight and rigidity giving the 18 inch barrel enough mass to manage heat without turning the build into a front-heavy rifle. A 1:8 inch twist rate is matched to the 6.5 Grendel chambering stabilizing the heavier bullet weights that the cartridge is often loaded with. The bead blasted finish gives the barrel a uniform low-glare surface that resists fingerprints and handles daily range use well. A rifle length gas system times the gas impulse for smoother cycling and reduced felt recoil compared to a shorter gas system in the same caliber. The 5/8x24 threaded muzzle accepts a standard range of brakes compensators and suppressors giving the builder flexibility to tune the rifle s recoil and sound signature. Built to fit AR-15 platforms including the Aero Precision M4E1 this barrel drops into an existing upper for builders upgrading a Grendel rifle or finishing a new one. It is a solid foundation for shooters who want dependable accuracy from a mid-length precision AR build. Ballistic Advantage Premium Series SPR Barrel Specifications Manufacturer: Ballistic Advantage Model: Premium Series SPR Barrel Caliber: 6.5 Grendel Barrel Length: 18 Material: 416 Stainless Steel Finish: Bead Blasted Color: Silver Twist Rate: 1:8 Gas System Length: Rifle Gas Block Diameter: 0.750 Muzzle Threads: 5/8x24 Weight: 2.456 lbs Compatible Hosts: AR-15 Aero Precision M4E1 Available At: GrabAGun