my Steyr AUG assault rifle with removable mag(from Chas Irish) The Steyr AUG was desinged in 1977 by Horst Wesp, Karl Wagner,and Karl Möser. The AUG is an Austrian 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,[1] where it replaced the 7.62 mm StG 58 automatic rifle (a license-built FN FAL).[2] In production since 1978, it is the standard small arm of the Austrian Bundesheer and various national police units.