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are you asking about the Xgrip if so the xgrip allows the use of larger mags in smaller sig p320 guns it is a adapter that goes over the mag to extend the grip It covers the part of a larger mag that would extend below the grip in a smaller gun this gun would not need a xgrip to use full size mags here are the Xgrips from sig http://x-grips.com/sigsauer/

Jose, the X-Grip Modules are simply different Modularized sizes of Frames, S , M , and L that allow different caliber slides to be used. Details here : https://www.sigsauer.com/store/p320-x-carry-grip-module-9mm-40-auto-357sig.html