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The AUG is an Austrian bullpup 5.56mm assault rifle, designed in the early 1970s by Steyr Mannlicher GmbH & Co KG (formerly Steyr-Daimler-Puch). The AUG (Armee-Universal-Gewehr—"universal army rifle") was adopted by the Austrian Army as the StG 77 (Sturmgewehr 77) in 1977,[3] where it replaced the 7.62mm StG 58 automatic rifle (a license-built FN FAL).[4] In production since 1978, it is the standard small arm of the Austrian Bundesheer and various national police units.

The rifle and its variants have also been adopted by the armed forces of Argentina, Australia, New Zealand, Bolivia, Ecuador, Ireland, Luxembourg, Saudi Arabia, Tunisia, Pakistan, and the U.S. Immigration and Customs Enforcement agency.