The Steyr AUG (German: Armee-Universal-Gewehr; English: Universal army rifle), also known as the STG.77 (German: Sturmgewehr 77; English: Assault rifle 77), is an Austrian, bullpup-configured assault rifle, designed in the late 1960s by Steyr Mannlicher GmbH & Co KG. The AUG was developed to replace the Austrian army's bulky Stg.58 rifle (a variant of the FN FAL); the AUG fires the lighter 5.56x45mm cartridge, is built from light weight polymers, is compatible with left-handed shooting, and incorporates a built in optical sight. The AUG was adopted by the Austrian army in 1977 and would go on to see large export success with other countries, also being adopted by the militaries of Australia, New Zeland, Oman, Malaysia, and others.
The AUG A3 is the most recent version of the AUG, removing the built in sight in favor of a Picatinny rail system to allow mounting of various other optics, foregrips, laser sights, and underbarrel 40mm grenade launchers. The AUG Para is a 9mm SMG variant of the AUG.
The AUG A3 appears in six games in the Battlefield series, occasionally named the AUG or STG.77.