Careful not to use too much heat...This process required between 600-900 degrees of heat that can draw the temper out of certain steels. Also, I would approach with caution if you considering using this method for treating your reloading dies. The process can leave light scaling on the interior of the die, so it is only recommended for parts where tolerances are unimportant. These dies are push through bullet sizer bodies, and no scaling resulted. Approach with caution and practice practice practice before trying it on a gun part. Not recommended for complete firearms, although it could be used if you are careful.