Nitride coating is available for firearms. The company that does the hydraulic rods may even do firearms. They charge by the batch of 5 rifles. 5 rifles same price as 1. Totally disassembled and prepped to your desired finish before hand. The coating requires several cleaning steps. Then nitriding. Very thin, very hard. It is because of the hardness that you/gunsmith must prep to spec, because once nitrided difficult to change. Beautiful black finish that looks "thin" like blueing, not like CeraKote. .0002-3" thick. 1 year ago it was about $150 for the batch
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