Ballistic Advantage BABL308018P: This .308 chambered (DPMS style) 18 inch barrel is machined from 416R Stainless Steel with a bead blasted finish. Ballistic Advantage\'s Premium Series Barrels are HP and MPI tested, ensuring the best in quality and accuracy. Note: Hanson Series Barrels feature Ballistic Advantage\'s proprietary BA Hanson profile and include a pinned lo-pro gas block. Hanson barrels are not designed to work with aftermarket piston kits.