My Norinco came in the original 7.62x25mm and I got a 38 Super barrel along with it. Later I purchased a 9mm barrel. The 38 Super works fine with factory loads and handloads to factory levels, as does the 9mm but hot 38 Super loads tend to lock the slide back so I stick with factory loads for that one. I'm not impressed with the 9mm in the Tok - I would rather shoot 9mm from a dedicated 9; as it is, both the 9 and 38 Super shoot high from the pistol with its sights regulated for the flatter shooting 7.62x25mm.