The M16 Mk. II pulse rifle is the primary assault rifle of GDI and Nod light infantry units during the Second Tiberium War. There were at least four different versions of the rifle manufactured by both sides, chambered for .22 caliber ammunition fired using a pulse action mechanism. They are designed to interface with HUDs of modern armour (such as the GDI combat suits). Of the variants, Nod's primary model was most identifiable as a descendent of the M16, together with an under-barrel grenade launcher.