FX-05 Xiuhcoatl assault rifle, an envelope of Call of Juarez: The Cartel. -The model is correctly in the hands and has its icon. Mexican FX-05 Xiuhcoatl assault rifle (Xiuhcoatl-snake-lightning (act.), character and weapon of the Aztec god Huitzilopochtli-God of war and patron of Mexico), developed in 2005, for the Mexican army as a replacement for G3 assault rifles, into service in 2008, Is almost an exact copy of the G36, H&K due to this "almost" H&K company has been unable to win a lawsuit on illegal copying, filed its 2007 g.