Lightweight profile, button-rifled, stainless steel 6.5 Grendel barrel. Features 1:7.5 twist rate, glass bead blasted, fluting for weight reduction, 9/16-24 TPI RH muzzle threading, 60-degree muzzle crown, and barrel extension installed. Gas port is positioned at mid-length. Manufactured by Alexander Arms and sold with exactly the same specifications as the Alexander Arms 6.5 Grendel 16-inch Lite upper receiver assembly. Fully-inspected and fully-prepared for assembly into an AR-15 platform rifle. Barrel weight is 1.85 pounds. Gas block diameter is 0.750 inches.