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Use the search feature for salt bath nitriding
 

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Use the search feature for salt bath nitriding
Otherwise known as nitrocarburizing. It IS the same as the finish on the HK , Glock, or Walther (German made) pistols. Known as Tennifer or Melonite in this country. This process does not add any material to the part as it works beneath the surface of the part. I have been toying with doing this to rifle barrels for a while. By the way, this process was developed to increase the life of the German MG42 barrels. Makes them VERY HARD!! I actually had a chance to take a file to a real MG42 barrel by a gunsmith. The file just skated over the metal. It was so hard, the file could not cut the steel!!
 
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