Lantac 9INE 9mm Luger G17 Handgun Barrel - Stainless - Professional upgrade drop in barrels for Gen 3 & 4 Glock 17 & 19 Pistols. Our Match Grade barrels are precision machined from Certified pre hardened DFARS compliant 416R chromium gun barrel quality stainless steel, to extremely tight tolerances and exacting details. 416R stainless steel is renowned for its corrosion resistance, machinability and high tensile strength, it is the industry standard for Match Grade barrel manufacturing. Lantacs machining and production process delivers an ultra-precise barrel with tightened slide fit & lock up for improved accuracy. Lantac's barrels are 6 groove, cut rifled, 1: 10 Twist Right Hand, fully inspected, double honed (rough and finish) to produce a bore with a Max Roughness Average (RA) of 12. Chambers are Match Grade SAAMI specification, precision cut and polished to a maximum Roughness Average (RA) of 16. The pre hardened 416R stainless steel is stress relieved to a proprietary recipe after rifling and final hardness is 38-42 Rockwell C before final shaping and profiling work is done. Final dimension are held to a +/- 0.0002" deviation for maximum consistency , accuracy and quality.