Steyr AUG is a family of firearms, first introduced in 1977 by the Austrian company Steyr Mannlicher.[2] AUG stands for Armee-Universal-Gewehr, meaning "Universal Army Rifle."[5] It is often used to refer to a specific version, especially the initial version which was 5.56 mm NATO bullpup assault rifle, with a distinctive green frame and integrated scope. It has since spawned a variety of related weapons including a submachine gun, a designated marksman rifle, and light machine guns. It has been adopted by a number of armed forces and organizations and is the standard service rifle of Austria, Australia, New Zealand, Luxembourg, Ireland, and at one time Malaysia.