Lakeline Ported Barrel for the 9mm Taurus GX4 and GX4 TORO Constructed of 416R stainless steel Target grade, precision Cut Rifling, 1 : 10 twist 3.34 inch barrel length with SAAMI specification chamber 11 degree Target Crown Titanium Nitrite Gold Colored Finish (TiN) Engineered and Made in the U.S.A. Stainless Finish Reduces muzzle flip for faster follow up shots. These are just a joy to shoot and they add just a tiny bit of length, about 1/4", to the pistol.