The AUG is an Austrian 5.56 mm assault rifle, designed in the early 1970s 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 1977,[1] where it replaced the aging 7.62 mm StG 58 automatic rifle (a license-built FN FAL).[2] In production since 1978, it is the standard small arm of the Austrian Bundesheer and various national police units. It 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), Ireland, Luxembourg, Saudi Arabia, Tunisia (introduced in 1978), Pakistan and since 1988—the U.S. Immigration and Customs Enforcement agency.
Design details
Austrian soldiers deployed with the Steyr AUG.
The StG 77 of the Austrian Bundesheer.
An Austrian soldier equipped with the standard-length Steyr AUG.
The AUG was 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, among which are: 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.[3] The AUG is a modular, bullpup configuration rifle that employs a high level of synthetic 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.[3] The AUG is a selective fire weapon with a conventional gas piston operated action that fires from a closed bolt.[3] The gas cylinder is offset to the right side of the barrel and works with one of the two guide rods. 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.
Design details
Austrian soldiers deployed with the Steyr AUG.
The StG 77 of the Austrian Bundesheer.
An Austrian soldier equipped with the standard-length Steyr AUG.
The AUG was 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, among which are: 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.[3] The AUG is a modular, bullpup configuration rifle that employs a high level of synthetic 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.[3] The AUG is a selective fire weapon with a conventional gas piston operated action that fires from a closed bolt.[3] The gas cylinder is offset to the right side of the barrel and works with one of the two guide rods. 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 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.
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