The Steyr AUG is an Austrian select fire assault rifle. It uses the 5.56x45mm NATO cartridge and the standard variant comes most the time with non-electronic scope. Many variants of this rifle have been made including a light machine gun variant, a 9x19mm parabellumsubmachine gun variant, a semi-automatic civilian variant and more. It is a bullpup rifle, meaning that the magazine and firing mechanism is behind the trigger, so the barrel can be longer than on standard assault rifles without increasing the overall length of the rifle. It also means that its stock is heavier than on standard assault rifles, making it useful as a melee weapon. However, due to the location of the ejection port on bullpup rifles, firing a right-handed model of a bullpup rifle with your left hand and vice versa will likely result in hot spent cases flying in your face. Some bullpup rifles have solved this problem by ejecting downward or forward. The Steyr AUG has an effective range of about 300 meters, wich is standard for assault rifles.
The Steyr AUG is the standard military weapon of its home country, Austria. It has also been adopted by armed forces of Argentina, Bolivia, Ecuador, Ireland, Luxembourg, Saudi-Arabia, Tunisia and Pakistan. It is also used by the U.S. Custom service. Also is version of it manufactured in Australia, and used by their and New-Zealand's armed forces. The cartridge it uses, the 5.56x45mm NATO is one of the most used in the world.
The rifle can either be left or right handed so make a note to get the correct model if possible. Like said before, firing a right-handed model of the Steyr AUG with your left hand and vice-versa will likely result in hot spent cases flying into your face.
If you found a model not suited for your preference, remember that the bolt and ejection port cover of the Steyr AUG can be swapped, turning the rifle into a dedicated left-handed or right-handed version.