I thought it was the other way around that Nitrating processes was what caused enviormental concern, not chrome lining. I believe LWRC uses nitrated barrels.
NiCorr™ surface conversion has proved more lubricious, harder wearing, more heat and corrosion resistant than the hard chrome normally used in the bore. Our barrels can handle 20,000 rounds before replacement, as compared to 6,000-10,000 rounds on a standard M4.-LWRC websiteHis claims don't appear to be true.We offer a variety of NiCorr treatments depending on the finish and corrosion resistance required. NiCorr-C leaves a hard, low microfinish, black corrosion resistant surface capable of resisting 360+ hours of accelerated salt spray as tested per ASTM B117. It competes favorably with Chrome and Electroless Nickel Plating. Plating is eliminated: saving cost of plating, transportation time. NiCorr is environmentally benign. -www.syracuseheattreating.com
"The salts used are highly toxic - Disposal of salts are controlled by stringent environmental laws in western countries and has increased the costs involved in using salt baths. This is one of the most significant reasons the process has fallen out of favor in recent decades."



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