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Ghris, I tell you what it is you figure the difference. Polycoat: Application of a bituminous, thixotropic cold asphalt, (water soluble) synthetic resin that creates a waterproof protective film resistant to atmospheric agents. Nitride: A heat treating process that diffuses nitrogen into the surface of the metal to create a strong case hardened surface. The nitride goes into the metal. Polycoat is a durable resin on the metal.
Chris, I think they all have a base nitride finish as some folks have called CZ on this here : https://www.reddit.com/r/CZFirearms/comments/6gat9w/looking_to_get_the_shadow_2_confused_about_the/
Chris, All CZ's have a nitride finish on all their slides.
