Swarovski 1.5× telescopic sight, emergency battle sights, and Picatinny rail for various optics The Steyr AUG ( German : Armee-Universal-Gewehr , lit. 'universal army 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 Steyr Mannlicher GmbH & Co KG.