Advanced Armament Corp

AAC Threaded pistol barrels are precision machined from heat treated 416R stainless steel. These barrels feature a durable corrosion resistant matte black Nitride finish. The barrel features a 1:16 twist rate and this particular barrel is threaded Metric 13.5 x 1 Left Hand. Specifications and Features: AAC Replacement Barrel 103555 - Springfield Armory XD Service Model Full Size 9mm Luger - Threaded Metric 13.5 x 1 Left Hand - 1:16 Twist Rate - 416R Stainless Steel - Nitride Finish - Matte Black