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Rockit, #8 front and #8 rear Sir. Both the 9mm and .40 versions of the SIG P320C come with #6 front / #8 rear from the factory, while the full-size P320 comes with #8 front / #8 rear.

These numbers are Sigs sizing codes and differ from gun to gun, mostly due to barrel length. These numbers make it easier for you to change sites … say from white dot to night sights or fiber optic. .