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Michael, 3 magazines come with the LE editions of Sig handguns. The Nitron finish is the Sig DLC nitro carbonizing treatment that case hardens into the slide/parts similar melonite or tenifer treatments that go into the metal instead of just coating it against the environment like bluing.

Michael, The Nitron finish is a heat treating process with chemical bath to create a very hard surface with an oxide (black) finish. It's a Physical Vapor Deposition Coating applied by IONBOND. It's actually amorphous Tunsten DLC (Diamond Like Carbon). Most manufacturers including Sig LE pistol packages include (3) Magazines over the standard package (2) Magazines.

Nitron is what Sig calls the Coating on their firearms. different packages get different accessories including mags may times the packages with 3 mags are the Qualified professional packages (LE/Military)

Nitron is what Sig calls the Coating on their firearms. different packages get different accessories including mags may times the packages with 3 mags are the Qualified professional packages (LE/Military)

Michael - Nitron is name given to the process Sig Sauer utilizes to treat the metal parts of their handguns to prevent corrosion. It is done for both protection and appearance. The gun comes with three mags simply because the extra mag is Sig Sauer (and other manufacturers) 'enhancement' of firearms produced/marketed for law enforcement personnel. It gives the officers a ;'duty ready' package out-of-the-box.