Titanium Nitride is the most frequently used ceramic coating on machine tools. Bright gold in color, it is often applied where both wear resistance and appearance are important.
TiN will last for thousands of rounds on your firearm parts when cared for properly.
Zirconium Nitride ZRN
The most biocompatible of the ceramic hard nitrides, Zirconium Nitride is lighter in color than TiN gold. It is used extensively in cutting applications where other coatings have failed. Its light gold appearance, high corrosion resistance, and high hardness have made it the standard coating for high use hardware.