16 inch 9mm Pistol Caliber AR-15 Barrel, 4150 CMV and Nitrided, 1/10 Twist Barrel Profile - made by White Label Armory. Our barrels are produced in house, from raw bar stock to finished product. We drill, ream, rifle, contour and assemble, with the help of our fully automated and robotic driven production line. Our barrels are properly stress relieved after rifling. Our quality control system ensures that all barrels are dimensionally correct and bores fall well within their individual tolerance. You won't find a better barrel at this price. Weight 2 Length 16 Profile N/A Twist 1:10 Finish Nitride Material 4150 CMV Thread Pitch 1/2x28 Caliber 9MM Feed Ramp N/A Flutes N/A Gas System N/A Rifling Conventional Gas Block System N/A