This 11.5 6.5 Grendel barrel is the perfect starting point for your very own 6.5 Grendel SBR or Pistol build! - The barrel specs are: - Button-rifled 416 R stainless steel 6.5 Grendel barrel - 1:7.5 twist rate - 5/8-24 TPI RH muzzle threading - 60-degree muzzle crown - Barrel extension installed - Gas port is positioned at carbine length - Exactly the same specifications as the Alexander Arms� 6.5 Grendel 11.5-inch upper receiver assembly - Fully-inspected and fully-prepared for assembly into an AR-15 platform rifle - Barrel weight is 1.36 pounds - Gas block diameter is 0.875 inches