Sam Fisher- SIG MPX

  Briggs and Fisher turned over their duffel bags, and the squad leaders came forward and picked through their pistols, trifocals, and pair of SIG MPX submachine guns they were toting. Briggs said the trifocals were just prototype night-vision goggles, and the troops dismissed them. They did admire the MPXs because they were shaped like miniature assault rifles with curved thirty-round magazines and were the only submachine guns in the world that allowed the operator to change barrel length, caliber, and stock configuration in the field to meet mission requirements.

- Blacklist Aftermath, Chapter 32