If you have the Bruniton model, then the barrel and slide can be Parkerized. The outside of the barrel is just a regular matte bluing and can be removed with any regular blue remover. The Bruniton on the slide is a Teflon epoxy. It would be removed the same as any of the other Teflon finishes such as Black-T. Sandblasting I guess.
The frame and slide of the INOX 92 are stainless and cannot be Parkerized.
On either model the frame is aluminum which cannot be Parkerized.