Steyr AUG STG77 5.56 NATO

In 1970s, Steyr Mannlicher developed a 5.56mm NATO bullpup rifle. The AUG was selected & adopted by the Austrian Army as the Sturmgewehr 77 in 1977. The AUG bullpup was a huge commercial success, & in its original configuration, it was adopted by the armed forces of more than 35 countries around the world.

Technical Data

Steyr AUG (Armee Universal Gewehr)
Country of Origin: Austria
Manufacturer: Steyr Mannlicher of Austria
Steyr Daimler Puch of America
Caliber: 5.56 mm NATO – .223 Remington
9mm variant & conversion kit available
Barrel Length: 508mm
20 inches
Barrel Twist: Right-hand twist of one turn in 9 inches
Chamber & Bore: Hammer Forged – Chrome Plated
Overall Length: 790mm
31 inches
Height: 275mm
11 inches
Without Magazine
7.9 pounds
Weight of Empty
0.3 pounds



Quality, Accuracy, Dependability, Versatility

Just a few reasons why the Steyr AUG (Armee Universal Gewehre) family of weapons are ideally suited to the special weapons needs of today’s military, special operations & law enforcement community. The Steyr AUG weapon system is an example of modern manufacturing technology, the use of state-of-the-art materials, and forward thinking design innovations.

Since the time of its introduction, the Steyr AUG has been the answer to a need for a modern, ergonomic, durable and accurate combat rifle. First fielded with the Austrian Army, the AUG in its various forms has been adopted by over 18 countries for use in their militaries and special forces units. Additionally, the AUG has seen use in countless numbers of law enforcement agencies worldwide.


Steyr AUG Family

Steyr AUG Family

Short Overall Length


The Steyr AUG is designed on a “Bull Pup ” principle which makes it 25% shorter than other rifles with similar barrel lengths without settling ballistic performance. The bullpup design does away with the folding stock feature found on many weapon types, allowing the AUG to be instantly available for accurate shoulder firing.

A shorter overall length means unmatched maneuverability which gives the user faster target engagement & allows the AUG to be easily maneuvered through tiny spaces such as a patrol car, SWAT vehicles, and APC’s. Additionally, the shorter length gives the user a decisive edge when close quarter situations are encountered.

The Bullpup design also allows a longer barrel length thus enhancing accuracy & increasing the terminal velocities of the ammunition. Therefore the AUG has a choice over conventional weapons which depend on a shorter barrel to decrease the overall length of the weapon.


Integral Optical Sight

The Steyr AUG comes test with a 1.5x optical sight which is built-in to the receiver & is fully protected from damage by the aluminum receiver housing. Additionally, the optic is sealed in its housing & is waterproof to a depth of 30 feet. The optical sight housing also serves as a carrying handle for the weapon.

The use of the optical sight has been proven to increase hit probability & decrease target acquisition period (spotting & identifying the target) and engagement time (the decision to fire and put a round on target). Target acquisition & engagement time with the AUG optical sight has been estimated at 1.5 seconds (where just two points are aligned) versus the traditional open sight at 3 seconds (where three periods must be aligned).

Target acquisition time is decreased by one-half which means the user is faster & therefore has a decisive advantage in the field. In low light or night conditions, optical sights have proven far better than conventional sights, & target acquisition is likely for the AUG long after the ability to use a traditional open view has passed. The 1.5x magnification of the AUG optical sight enables the user to fire the weapon with both eyes wide eliminating the worry of losing peripheral vision & developing “tunnel vision” while sighting through the optic. Additionally, the optical sight on the AUG reduces training time for the user – thus significantly reducing ammunition and training costs.


AUG Major Component Groups

Ergonomic Design

When the Steyr AUG was designed, specific attention was paid to the shape of the weapon & how it would interact with the human user. The result is a perfectly balanced and human engineered weapon.

The AUG’s center of balance is directly centered at the pistol grip allowing it to be operated with one hand if necessary as opposed to other weapon types which tend to be front heavy and cumbersome. Additionally, the safety mechanism is operated by the thumb and index finger and is fully ambidextrous, allowing it to be manipulated at will.

This gives the AUG an advantage, as the safety may always be in the “on” position; at the moment the user has acquired a target & is ready to fire, the safety can be deactivated, the weapon fired, & the safety reactivated without any noticeable loss in target engagement time. The left handed person was also kept in mind, as the AUG can easily be adapted in seconds for left handed users with the installation of a left-hand bolt assembly.

The user does not have to think about looking for a fire selector on the AUG. Modes of fire are selected by the AUG’s two stage trigger, short pulls of the trigger provide single shots and a long pull to the rear provides full auto or burst fire. Additionally, the AUG selective fire rifles can be equipped to fire semi-auto only by the installation of a semi-auto hammer group.



The Steyr AUG has been designed to be the most durable and dependable weapon available today. More than 23 components of the AUG system including the stock, magazine and hammer mechanism are made of high-impact, extremely-rigid, synthetic material. These parts are friction resistant and need no lubrication to operate, giving them a very long life cycle.

The receiver is made of a precision cast and machined high strength alloy which is corrosion resistant and easy to maintain. This receiver encloses a cold hammer forged, chrome-lined barrel with a minimum service life of 15,000 rounds. The AUG is easily disassembled to principal components without tools, and most parts require no fitting. This decreases basic maintenance cost, as armory training is very simple.



The AUG weapon system is completely modular. All components, including barrels, receivers, and spare parts are completely interchangeable from weapon to weapon. This is an advantage, as with the addition of specialized equipment and accessories, a single AUG can be tailored to accommodate a wide variety of operational requirements. Using a “building block” principle, the user can configure the AUG in any of its various forms.



3 Replies to “Steyr AUG STG77 5.56 NATO”

  1. Blueberry pie is something that I would like to eat on every-day basic. I’ve been having a blueberry moment and it’s not over yet. Blueberry Pancakes and Blueberry Jam, sure. Blueberry Syrup, Blueberry Ice Cream and Blueberry-Buttermilk, Blueberry Pie and many more.

    And yeah I have a quick word on the sugar – start with the lesser amount and taste. Now that blueberries are truly in season, you might not want completely full amount.

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