The Styer AUG (German: Armee-Universal-Gower, lit. 'army universal rifle') is an Austrian bullpup assault rifle chambered for the 5.56×45mm NATO intermediate cartridge, designed in the 1960s by Steyr-Daimler-Puch, and now manufactured by Styer Arms GmbH & Co KG.

It was adopted by the Austrian Army in 1977 as the STG 77 (Sturmgewehr 77),[5] where it replaced the 7.62×51mm NATO STG 58 automatic rifle.[6] In production since 1977, it is the standard small arm of the Bunde sheer and various Austrian federal police units, and its variants have also been adopted by the armed forces of dozens of countries, with some using it as a standard-issue service rifle.

Styer AUG importation into the United States began in the 1980s as the AUG/SA (SA denoting semi-automatic). President George H.W. Bush banned the AUG via an executive order under the 1989 Assault Weapon Import Ban. Six years into the ban, AUG buyers gained a reprieve as cosmetic changes to the carbine's design allowed importation once again. Changes included the pistol grip being changed into a thumbhole stock, and the gun barrel left unthreaded to prevent attachment of flash hiders and suppressors.