The GK8 Gauss Gun is a new weapon designed by the United States. Unlike other weapons, it fires slugs of high-density alloys, such as tungsten carbide and depleted uranium, at velocities up to eight times the speed of sound.
It is primarily used by US soldiers, although members of the KPA are seen using captured Gauss Rifles in Crysis Warhead. It appears to be a bolt-action weapon, as the player tugs on a handle that is on the right side of the weapon between shots. Different iterations of this gun appears in all Crysis games. [Source: wikia]