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 – 1:8 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