Firearms are intricate machinery aimed at delivering projectiles through a firing mechanism. From a mechanical point of view, all the moving parts of firearms affect the safety, accuracy, and durability through a single or a combined phenomenon of wear, tear, and oxidation. For years, firearm users have tried a variety of material selections and treatment processes to enhance the functionality of shooting. PVD (Physical Vapor Deposition) technology emerged from the cutting tool industry and finds its way into the firearm sector with its superior wear and corrosion resistance.