All KKM barrels are made using certified 416R gun-barrel quality stainless steel bar stock. These barrels are then heat treated and vacuum tempered to 42 RC. All of our barrels are CNC machined to obtain superior dimensional tolerances over stock. Because of our advanced proprietary button rifling process, all KKM barrels offer greater accuracy over stock barrels. Our Glock barrels come with fully supported SAAMI spec. match chambers for shooting factory or reloaded ammunition. Converts from .40 to 9mm. These are drop-in barrels, no fitting or machining required.
I bought this to shoot 9mm out of my G33 just cause 9mm is so much easier to find and cheaper. This is a very nicely made barrel feed ramp was polished nicely. Also it's a little heavier than the stock .357 sig barrel so recoil is also much lower than standard 9mm. All I changed was the barrel and magazine to 9mm put 250 rounds through it today without a single issue.