Lilja Group Buy Barrel Accuracy

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It's not a secret. It's a well-known process dating back to before the 1950's among metallurgists in England.

There is also gaseous ferritic nitrocarburizing. If you want to shoot a lot of copper-washed steel ammunition from the East, it's great to use.

With every process, there are advantages and compromises. Nitriding needs to be done correctly with quality steel alloys, with the right amount of immersion and suspension time, otherwise you run into major problems. There is a quench, polish, quench process to several of the methods.