The AUG A1 is the original and standard version of the AUG family. The AUG A1 is fitted with a fixed 1.5x scope and is available with a 508 mm, 406 mm and 350 mm barrel. To distinguish between the barrel lengths the unofficial designations AUG Rifle, AUG Carbine and AUG Commando are used. The 350 mm barrel is very uncommon. In all three barrel lengths the AUG is also available as the AUG A2. The A2 is completely similar to the A1, but the 1.5x scope mount is removeable and a single Picatinny rail can be installed.

The Austeyr is the Australian version of the AUG. Officially it is known as the F88. It is very similar to the original AUG A1, but differs in some minor details. The rifling is 178mm instead of 229mm. This results in a better stabalization of the 5.56mm NATO round, but the older M193 cannot be used. A bayonet lug is fitted as standard. A lockout selector allows the operator to disable the full auto option of the two stage trigger. Models supplied to New Zealand have a cross hair in the reticle. The F88 has a 508mm barrel and the F88C has a 406mm barrel. The F88S and F88S-A1C are similar models but fitted with a Picatinny rail. The F88 GLA features a bar below the barrel for mounting the M203PI.

The AUG A3 is the latest version in the AUG family. It is a highly modified version of the AUG A1. Instead of a fixed 1.5x sight unit a long Picatinny accessory rail is mounted on top. Additional accessory rails are mounted at the forward grip. The A3 also features an external bolt release and an optional 3 round burst ability. The standard model is fitted with a 455mm barrel, but it is also available with a 365mm, 406mm and 508mm barrel.

The AUG A3 SF is a different modification of the AUG A1 than the standard AUG A3. Unlike the AUG A3 it does not feature a long Picatinny rail on top of the receiver. Instead it is fitted with new large optical sight which is fitted with Picatinny rails on all sides. At first it was known as the AUG A2 Commando. Normally it is fitted with a 406mm barrel, but is available with 365mm and 508mm barrels.

The AUG Para is a sub machine gun conversion of the AUG A1 or A2. Unlike the other models it does not fire the 5.56x45mm round. It fires the 9x19mm round from a 25 round magazine. The conversion does not only consist of changing the barrel, but also includes fitting a magazine adapter. A few centimeters from the muzzle the barrel is threaded to accept a silencer.

The AUG A3 XS is a sub machine gun conversion similar to the AUG Para, but is based on the newer AUG A3 model. It features an abundance of Picatinny rails for mounting iron sights, optics and accessories. The barrel on the AUG A3 XS shorter than the one on the AUG Para and it is not possible to mount a silencer.

The AUG H-Bar is the heavy barrel version of the AUG A1. It was designed to act as a light support weapon. For that role it is fitted with a long 621 mm barrel with a fixed foldable bipod. Normally the AUG H-Bar is issued with 42 round magazines, but can also use the standard 30 round magazines. The AUG LMG is a less common version of the AUG H-Bar. It fires from the open bolt position and is fitted with a 4x scope instead of the standard 1.5x scope. The AUG H-Bar-T and LMG-T versions are fitted with Picatinny rail similar as the one on the AUG A2. The AUG-H-Bar-T was marketed with a Kahles 6x42 scope as a designated marksman rifle.