TiN Coated Gas Piston
This Gas Piston is manufactured correctly but has a cosmetic flaw. The engraving is too light (see photo).
TiN coated piston - The pistons are hard coated with a gold colored Titanium Nitride (TiN) finish. This coating, often used on machine cutting tools, helps reduce galling and pitting and holds up better to the high heat and abrasiveness of gunpowder and primers. The resulting effect is a smoother action an improved life of the piston and cylinder.