Steyr AUG

Steyr AUG

Steyr AUG A1 with 508 mm (20.0 in) barrel
Type Bullpup assault rifle
Carbine
Light machine gun
Submachine gun
Place of origin Austria
Service history
In service 1978–present[1]
Used by See Users
Wars See Conflicts
Production history
Designer Horst Wesp
Karl Wagner
Karl Möse
Designed 1977
Manufacturer Steyr Mannlicher
Thales Australia, Lithgow Facility
SME Ordnance
Produced
  • 1978–present (Standard)[1]
  • 1988–present (Para)[1]
  • 2004–present (A3)
  • 2007–present (A3 SF)
Variants See Variants
Specifications
Weight
  • 3.6 kg (7.9 lb) (Standard)
  • 3.3 kg (7.3 lb) (Carbine)
  • 3.2 kg (7.1 lb) (Subcarbine)
  • 3.9 kg (8.6 lb) (HBAR)
  • 3.3 kg (7.3 lb) (Para)[1]
Length
  • 790 mm (31.1 in) (Standard)[1]
  • 690 mm (27.2 in) (Carbine)
  • 630 mm (24.8 in) (Subcarbine)
  • 900 mm (35.4 in) (HBAR)
  • 665 mm (26.2 in) (Para)[1]
Barrel length
  • 508 mm (20.0 in) (Standard)[1]
  • 407 mm (16.0 in) (Carbine)
  • 350 mm (13.8 in) (Subcarbine)
  • 621 mm (24.4 in) (HBAR)
  • 420 mm (16.5 in) (Para)[1]

Cartridge
Action Gas-operated, rotating bolt
Rate of fire 680–750 rounds/min[2]
Muzzle velocity Standard rifle: 970 m/s (3,182 ft/s)
Effective firing range 300 metres (980 ft)
Maximum firing range 500 metres (1,600 ft)
Feed system
Sights Swarovski 1.5x telescopic sight, emergency battle sights, various optics

The Steyr AUG is an Austrian bullpup 5.56×45mm NATO assault rifle, designed in the 1960s by Steyr Mannlicher GmbH & Co KG (formerly Steyr-Daimler-Puch). The AUG (Armee-Universal-Gewehr—"universal army rifle") was adopted by the Austrian Army as the StG 77 (Sturmgewehr 77) in 1978,[3] where it replaced the 7.62×51mm StG 58 automatic rifle (a licence-built FN FAL).[4] In production since 1978, it is the standard small arm of the Austrian Bundesheer and various national police units.

The rifle and its variants have also been adopted by the armed forces of Argentina, Australia, Bolivia, Ecuador, Ireland, Luxembourg, Malaysia, New Zealand, Oman, Saudi Arabia, Tunisia, Pakistan, the Falkland Islands Defence Force and the U.S. Immigration and Customs Enforcement.

Design details

Austrian soldiers train with the Steyr AUG.

The Steyr AUG, a bullpup 5.56×45mm automatic rifle, is a selective-fire weapon with a conventional gas-piston-operated action that fires from a closed bolt.[5] 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.[5]

The AUG uses the 5.56×45mm 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.

Features

The rifle features an Spz-kr type progressive trigger (pulling the trigger halfway produces semi-automatic fire, pulling the trigger all the way to the rear produces fully automatic fire) and a safety mechanism (cross-bolt, button type), located immediately above the hand grip.[5] In its "safe" position (white dot) the trigger is mechanically disabled; pressing the safety button to the left exposes a red dot and indicates the weapon is ready to fire. Some versions have an ALO or "automatic lockout", a small projection at the base of the trigger. This was first included on the Irish Defence Forces variant of the rifle, and soon after, the Australian Defence Forces variant. In the exposed position the ALO stops the trigger being squeezed past the semi-automatic position. If needed, the ALO can be pushed up to permit automatic fire.[6]

The rifle is fed from translucent, double-column box magazines (molded from a high-strength polymer) with a 30-round capacity and an empty weight of 130 g (4.6 oz). The light machine gun version of the AUG uses an extended 42-round magazine. An Argentine version of the FN FAL chambered in 5.56 mm NATO and known as the FALMP III Type 2 also used the AUG magazine.

Steyr AUG sight picture. Note: back-up iron sight on top of scope.
Steyr AUG A2 (407 mm (16.0 in) barrel) with Picatinny rail attached

Integrated with the receiver casting is a 1.5x telescopic sight made by Swarovski Optik.[5] It contains a simple black ring reticle with a basic rangefinder that is designed so that at 300 m (984.3 ft) a 180 cm (5.11 ft) tall man-size target will completely fill it, giving the shooter an accurate method of estimating range. The sight cannot be set to a specific range but can be adjusted for windage and elevation for an initial zero and is designed to be calibrated for 300 m. When so set, aiming at the centre of a target will produce a hit at all ranges out to 300 m. The rifle also has a back-up iron sight with a rear notch and front blade, cast into the top of the aluminium optical sight housing, used in case of failure or damage to the primary optical sight. The sight is also equipped with a set of three illuminated dots (one on the front blade and two at the rear) for use in low-level lighting conditions. In order to mount a wide range of optics and accessories, a receiver with a NATO-standard Picatinny rail and detachable carry handle was also developed and introduced in December 1997.

Three-pronged, open-type flash suppressors were used on the 350 mm (13.8 in), 407 mm (16.0 in) and 508 mm (20.0 in) length barrels, whereas the 621 mm (24.4 in) light machine gun barrel received a closed-type ported muzzle device (combination flash suppressor and compensator) and an integral, lightweight folding bipod. The flash suppressors are screwed to the muzzle and internally threaded to take a blank-firing attachment.

The rifle comes standard with four magazines, a muzzle cap, spare bolt for left-handed shooters, blank-firing adaptor, cleaning kit, sling and either an American M7 or German KCB-77 M1 bayonet.

Operating mechanism

The rotating bolt features 7 radial locking lugs and is unlocked by means of a pin on the bolt body and a recessed camming guide machined into the bolt carrier. The bolt carrier itself is guided by two guide rods brazed to it and these rods run inside steel bearings in the receiver. The guide rods are hollow and contain the return springs. The bolt also contains a claw extractor that forms the eighth locking lug and a spring-loaded "bump"-type casing ejector.

The gas cylinder is offset to the right side of the barrel and works with one of the two guide rods. The AUG uses a short-stroke piston system where the right guide rod serves as the action rod, transmitting the rearward motion of the gas-driven piston to the bolt carrier. The left-hand rod provides retracting handle pressure when connected by the forward assist and can also be used to remove fouling in the gas cylinder by utilizing the left-hand guide rod as a reamer. The firearm uses a 3-position gas valve. The first setting, marked with a small dot, is used for normal operation. The second setting, illustrated with a large dot, indicates fouled conditions. The third, "GR" closed position is used to launch rifle grenades (of the non-bullet trap type).

The AUG is hammer-fired and the firing mechanism is contained in the rear of the stock, near the butt, covered by a synthetic rubber shoulder plate. The hammer group is made entirely of plastics except for the springs and pins and is contained in an open-topped plastic box which lies between the magazine and the buttplate. During firing the recoiling bolt group travels over the top of it, resetting the hammer. Since the trigger is located some distance away, it transmits its energy through a sear lever which passes by the side of the magazine. The firing pin is operated by a plastic hammer under pressure from a coil spring.

Engineering

Austrian soldiers equipped with the standard-length Steyr AUG.

The quick-change barrel used in the AUG is cold hammer-forged by GFM-GmbH of Steyr Austria for increased precision and durability, its bore, chamber and certain components of the gas system are chrome-plated. The standard rifle-length barrel features 6 right-hand grooves and a rifling twist rate of 228 mm (1:9 in). An external sleeve is shrunk on to the barrel and carries the gas port and cylinder, gas valve and forward grip hinge jaw. There is a short cylinder which contains a piston and its associated return spring. The barrel locks into a steel insert inside the receiver through a system of eight lugs arranged around the chamber end and is equipped with a folding, vertical grip that helps to pivot and withdraw the barrel during barrel changes. The most compact of the barrels has a fixed vertical grip.

The receiver housing is a steel-reinforced aluminium extrusion finished with a baked enamel coating.[5] It holds the steel bearings for the barrel lugs and the guide rods. The non-reciprocating plastic cocking handle works in a slot on the left side of the receiver and is connected with the bolt carrier's left guide rod. The cocking handle has a forward assist feature—alternatively called a "silent cocking device"—used for pushing the bolt shut without recocking the rifle.[5][7] A bolt hold-open device locks the bolt carrier assembly back after the last round has been fired.[7] The newer AUG A3s possess a bolt release button, prior to this development all AUGs and the USR required the cocking handle being retracted to release the bolt group after a new magazine has been inserted. Older versions of the AUG can be upgraded to use the newer A3 stock and in turn the button release; however, it requires they also upgrade other key parts as well including the hammer pack.

The rifle's stock is made from fiberglass-reinforced polyamide 66. At the forward end is the pistol grip with an enlarged forward trigger guard completely enclosing the firing hand that allows the rifle to be operated with winter gloves.[5] The trigger is hung permanently on the pistol grip, together with its two operating rods which run in guides past the magazine housing. Behind that is the locking catch for the stock group. Pressing this to the right will separate the receiver and stock. The magazine catch is behind the housing, on the underside of the stock. Above the housing are the two ejector openings, one of which is always covered by a removable strip of plastic. The rear of the stock forms the actual shoulder rest which contains the hammer unit and the end of the bolt path. The butt is closed by an endplate which is held in place by the rear sling swivel. This swivel is attached to a pin which pushes in across the butt and secures the plate. There is a cavity under the buttplate that holds a cleaning kit.

Modularity

While the rifle is not fully ambidextrous, it can be configured for use by left- or right-handed operators by changing the bolt with one that has the extractor and ejector on the appropriate side, and moving the blanking plate to cover the ejection port not in use.

An Australian infantryman with the F88S Austeyr variant equipped with a M203 grenade launcher and Trijicon ACOG sight.
AUG-A1 with a 40mm AG36 grenade launcher

All AUG's are equipped with quick detachable barrels; including compact 350 mm (13.8 in) barrels, 407 mm (16.0 in) carbine barrels, 508 mm (20.0 in) standard rifle-length barrels and 621 mm (24.4 in) light machine gun barrels.[5] Rifles equipped with 508 mm (20.0 in) pattern barrels produced for military purposes are also equipped with bayonet lugs. The 407 mm (16.0 in) and 508 mm (20.0 in) barrels are capable of launching NATO STANAG type 22mm rifle grenades from their integral flash hiders without the use of an adapter. AUG barrels can also mount 40 mm M203 or AG36 grenade launchers. Steyr also offers 508 mm (20.0 in) barrel configurations fitted with a fixed, post front-sight used on the standard rifle version with aperture iron sights.

The Australian EF88 version of the AUG was tested with a new grenade launcher specifically designed for it called the ML40AUS GLA (Grenade Launcher Assembly), one of the lightest underbarrel grenade launchers at less than 1 kg (2.2 lb) due to steel, aluminium, and synthetic parts. The GLA is mounted on the rifle's bottom accessory rail with the trigger moving through a removable plug in the trigger guard that allows for operation of the launcher inside of it, moving it further back than other launchers to maintain center of balance and improve handling. The ML40AUS differs from the M203 by having a side-opening breech to allow for longer grenade rounds, a cross-bolt safety, and a new quadrant sight that mounts to the top rail alongside the rifle's optics.[8] On 21 January 2014 however, Thales announced they had instead selected the Steyr SL40 grenade launcher due to "significant" engineering concerns with the ML40AUS. The SL40 is a derivative of the Steyr GL40 launcher designed specifically for the EF88. It weighs 1.025 kg (2.26 lb) and has a 180 mm (7.1 in) long barrel. Though marginally heavier than the ML40AUS, it has the same attachment, firing mechanism, and control layout.[9]

In 2014 the Irish Army began issuing upgraded Steyr AUG rifles to its operational units. The modularity of the AUG allowed the Irish AUG A1 model rifles to be modernised without any gunsmithing, by replacing the original A1 housing/receiver group (with 1.5x optical sight) with an A3 housing/receiver group (with MIL-STD-1913 Picatinny rail on top and right side) allowing a modern optical sight to be fitted. The Trijicon ACOG 4x sight was selected as the new sight. The upgraded rifles are called the Steyr Aug Mod 14.

Variants

A semi-automatic version of the rifle known as the AUG P is available to the civilian and law enforcement markets. It features a shorter, 407 mm (16.0 in) barrel and a modified bolt, carrier and trigger assembly that will only allow semi-automatic fire. The rifle also has a slightly different optical sight that features a reticule with a fine dot in the center of the aiming circle, allowing for more precise aiming.

The light machine gun variant can be modified to fire from an open bolt (called the AUG LMG in this configuration). To accomplish this, a modified bolt carrier, striker and trigger mechanism with sear are used.

Based on the AUG, Steyr developed the 9 mm AUG submachine gun that fires the 9×19mm Parabellum pistol cartridge. It is an automatic, blowback-operated model that fires from a closed bolt. Unlike the rifle variants, this SMG has a unique 420 mm (16.5 in) barrel with six right-hand grooves at a 250 mm (1:9.8 in) rifling twist rate, ended with a recoil compensator, a slightly different charging handle and a magazine well conversion insert enabling the use of standard 25-round box magazines from the Steyr MPi 81 and TMP submachine guns. A conversion kit used to transform any rifle variant into the submachine gun is also available. It consists of a barrel, bolt, adapter insert and magazine.

Austrian variants

StG 77
Steyr AUG A1 (407 mm (16.0 in) barrel)
Steyr AUG A3
Steyr 9 Aug mm

Australian variants

An Australian soldier from 2RAR with a F88S Austeyr. Fitted is the standard issue, locally made 1.5x power sight.
An Australian soldier with an F88-A1 Austeyr rifle.
An Australian soldier briefs a U.S. Navy Admiral on the F88 GLA Austeyr. Note: the grenade launcher has been removed and is being held by the Admiral.
1. Longer top rail and introduction of side and bottom rails.
2. Length of Pull has been shortened by 15mm.
3. Modular Lower Forend.
4. Floating Barrel – increases accuracy.
5. Fluted Barrel – dissipates heat from automatic fire.
6. Folding Cocking Handle.
7. Improved Butt design – increased strength, ejection port cover recessed to improve reliability.
8. Provision for Electronic Architecture – to allow centralised control and power management of ancillary devices.
9. Bolt-together Butt – for easier disassembly.
10. Improved Grenade Launcher Mount – improves balance of the weapon.
11. Side-Loading Grenade Launcher (Steyr-Mannlicher SL40) – can fire all currently available 40mm low velocity grenades
12. Improved Grenade Launcher safety. The KORD RIC (Rifle Input Control) is Thales new electronic control system, and will also be integrated into the rifle.[23][24][25]

AUG clones

Conflicts

The Steyr AUG has been used in the following conflicts:
* East Timor
* War in Afghanistan
* Iraq War
* Syrian Civil War

Users

Map of Steyr AUG Operators
Argentinean Army soldiers with AUG rifles in 1986 in Puerto Deseado.
An officer of the Austrian counter-terrorism unit EKO Cobra handling a Steyr AUG rifle during an airborne operation.
Close-up of New Zealand Army soldier with an F88 Austeyr.
SEK-policeman with a Stey AUG in Bavaria, 2011

Non-State Actors

See also

References

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Bibliography

External links

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