Clint: The little I know about steel and welding tells me the reason for the different colored steels after welding is due to the fact that the molecular structure of the weld and the metal is not the same. To make uniform you must anneal or stress relieve and or thermo stress relieve and temper (controlled air cooling) after welding. This heat treat method makes the molecular structure of the weld match the metal you are mating it too as long as the weld material is of similiar chemistry as the barrel. Once annealed & cooled you can blue and you will not have that blue haze of a different color - everything will match. Knowing the chemistry of a luger is easy, non-destructive and destructive testing can be done for as little as $80.00 at any commerical metal testing laboratory. Take a scrap barrel of the several types available test them, match the welding rod before your procedure and what you have is a perfect job, undetectable to the untrained eye. Hope this helps. SAM
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