Steyr AUG

Steyr AUG

Steyr AUG

The AUG is an Austrian bullpup 5.56mm assault rifle was adopted by the Austrian Army as the StG 77 (Sturmgewehr 77) in 1977, where it replaced the 7.62mm StG 58 automatic rifle. In production since 1978, it is the standard small arm of the Austrian Bundesheer and various national police units.

The rifle has also been adopted by the armed forces of Argentina, Australia (accepted into service in 1985 and manufactured by Australian Defence Industries in Lithgow, this Austeyr model is also in use by New Zealand), Bolivia, Ecuador (since 1988), Republic of Ireland, Luxembourg, Saudi Arabia, Tunisia (introduced in 1978), Pakistan, and (since 1988) U.S. Customs (now the U.S. Immigration and Customs Enforcement agency).

The AUG, a bullpup 5.56mm assault rifle, is a selective fire weapon with a conventional gas piston operated action that fires from a closed bolt. Designed as a family of rifles that could be quickly adapted to a wide variety of roles with the change of the barrel to a desired length and profile, the AUG is a modular configuration rifle that employs a high level of polymer and advanced alloy components.

The primary variant of the rifle, designated the AUG A1, consists of six main assemblies: the barrel, receiver with integrated telescopic sight, bolt and carrier, trigger mechanism, stock and magazine.

The AUG uses the 5.56x45mm NATO cartridge and the standard 1:9 rifling twist will stabilize both SS109/M855 and M193 bullets. Some nations including Australia and New Zealand use a version with a 1:7 twist optimised for the SS109 NATO round.

The Steyr AUG rifle is fully ambidextrous. It can be configured for use by left-handed shooters by simply changing the bolt for a left-handed one with the extractor and ejector on opposite sides, and moving a blanking cap from the left ejection opening to the right.

Variants include a compact 350 mm (13.8 in) barrel, 407 mm (16.0 in) carbine barrel, 508 mm (20.0 in) standard rifle-length barrel and a 621 mm (24.4 in) light machine gun barrel.

Rifles equipped with 407 mm (16.0 in) and 508 mm (20.0 in) barrels are able to launch rifle grenades. 508 mm (20.0 in) pattern barrels produced for military purposes are also equipped with a bayonet lug. The manufacturer offers two other 508 mm (20.0 in) barrel configurations: the first – fitted with a fixed, post foresight (used on the standard rifle version with aperture iron sights) and the second type – equipped with a 40 mm M203 grenade launcher that can be used mounted on the standard length rifle or autonomously – as a stand-alone grenade launcher after attaching a shoulder pad to the end of the 5.56 mm barrel.

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  1. Australia is currently issuing the latest version of the
    locally produced Styer known as the EF-88. The E is for Enhanced and 88
    for the year of introduction of the first version of the AuStyer i n 1988 to
    the Australian Defence Force. This rifle is extensively different from
    the AUG77 and is based upon operational experiences in Iraq, Afghanistan and
    East Timor upon which many of these changes were incrementally introduced.
    These include a new and improved polymer housing, with a new shaped buttstock,
    which includes an added comb for better check weld and grips on the butt plate
    to assist with grip against the body in long hold positions and when firing the
    Grenade Launcher.

    A modified Gas block, receiver has been changed to improve reliability
    (sears used to be knocked out of action when firing GL) and modifications to extraction
    ports (lengthen by 4mm) for better extraction in all environments. The
    highly vulnerable cocking which had a tendency to break off is now more robust
    and folds away. The rifle now drains more effectively after being immersed in
    water which in the past had led to it becoming unserviceable.

    The barrel is no longer removable and comes with a fixed 20 inch standard and
    16 inch for the Carbine. It is fluted to dissipate heat and floated to
    increase accuracy. Extended new generation NATO Military-Standard STANAG
    4694 rails are used. The first is located at the top which is longer than
    previously incorporated and a second is a bottom rail replacing the forward
    folding hand grip. The third accessory rail is on right hand side of weapon. The length of pull has been shortened by 15mm
    relevant with modern chest carriage configurations and body armour. The trigger
    guard is modified to accept the side loading Steyr-Mannlicher SL40 Grenade Launcher which can fit on to the bottom
    accessory rail and is easily removed. Easy change out of accessories on
    all of the Mil-Standard rails.

    Provision for electronic architecture has been included in
    the design. It is expected that the KORD RIC (Rifle Input Control) for the SL40
    will be incorporated in the near future. The EF-88 in the 20 inch barrel configuration
    is approximately 500 grams lighter than the more recently in service and
    improved F-88SA2 it is replacing. Users claim that the EF-88 feels not only
    lighter but better balanced and easier to manipulate.