Yup I just bought a custom length KKM barrel in 106mm so I dont have to use the threaded barrel, and there is no difference when ordering between gen's. Same barrel will fit all gens.
Why does everyone want an OEM barrel thats threaded? Instead of a good quality aftermarket barrel? I didnt like lone wolf's stupid little wolf picture on the top of the barrel, or the SS look. However they do make blank marked ones, and even in black. Either way I still chose to go with KKM, they made me a 106mm barrel that is legal length for Canada and then I am having it PVD coated in my color choice. From what Zev tech has told me a KKM barrel is far better then the OEM Glock barrels threaded or not...
If you had a good quality legal barrel that isn't SS color and doesn't have any goofy markings, Id consider trading my threaded Glock barrel that I just bought and hasn't even had a single round fired through it yet