It’s easy just expensive but I have other builds and uses for the tank and solution so I can justify the price.

I used a scotch pad to clean up some spots and rough up the surface as I don’t have a media blaster. Then brake cleaner to make sure it’s clean. Some stuff like the grip module, small parts, mag catch, charging handle, flash hider, etc, I didn’t remove the old parkerizing as you can parkerize on top of old so they just got brake cleaner. Plug the barrel, heat up the mix in the tank (I have a propane burner), soak for 20min, flipping every 5 if not hanging and it’s done. Sprayed it off with water to rinse off any solution, let dry and oil.

It’s a lot less work than some bluing methods. Welding and doing the rest of the build is a hundred times more work and skill needed.