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Lain, In typical Sig fashion they have metric barrel threading. Instead of using a normal thread pitch, SIG SAUER decided to use a 13.5×1 metric left hand thread pitch for their barrels on the MPX's.

Hi Lain, It comes with a 13.5×1 metric left hand thread pitch

Lain, this Rifle includes a 13.5×1 metric Left Hand thread pitch. This is easily converted to the popular 1/2x28 thread pith with an adapter : https://www.infiniteproductsolutions.com/adapters/135LH-1228-BS/