Maintenance Manual 

Steyr Aug 

Cal .223 (5.56mm)

Steyr Mannlicher Aktiengesellshaft 
A-4400 Steyr Austria 
Tel 07252/896-0

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Manual for AUG Para

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Chapter `1

This manual is published for the information and guidance of personnel responsible for operation organizational, direct support maintained of the rifle Steyr Aug FA not civilians or gun enthusiasts. Pertinent information includes tabulated data, accessorizes and lubrication procedures, procedures for stripping. cleaning. repair. and assembly. Also included are basic issue items, tools, and replacement parts. 

Noted the operator user portion of this Manuel is chapter 1 - Chapter 3. 

mosquito repellent


2. Description
The Steyr Aug is a gas operated semi and fully automatic assault rifle with locked action. quickly changeable barrel and optical sight. It fires from a locked bolt position. Its special design makes it a short, handy rifle with high accuracy and reliability. Below is the Aug 508. 


The AUG consists of 6 main groups shown below. 

The First group to the top left is the barrel group. 
The second to the top right is the housing group.
The bottom right is the Trigger mechanism group.
The bottom left is the Magazine group
The center is the Butt Group. 
And below the Barrel group is the Gun Lock group. 


1. barrel group: right hand twist, 6 grooves, 6 lands. The chamber and the bore are chromium plated. The barrel grip is foldable. The Gas regulator ( with adjustment on the barrel) has two gas settings. ensuring function under all conditions. The third gas setting allows the firing of rifle grenades. 

2. Housing group- a 1.5 power scope is integrated into the carrying handle; on the top of the carrying handle is  an emergency sight. (editors note - it is completely useless.) The cocking handle is also part of the housing group as well as the front sling right. For fixing the barrel in the housing there is a barrel lock pin, in the front area. 

3. Trigger mechanism group: Most of the parts are made of synthetic material. The trigger mechanism is designed for semi or fully automatic fire, just controlled by the trigger. It is fixed in the rear of the butt.

4. Gun lock group- This assembly is made from special high grade steal. Regarding the locking action. the well- tried rotary locking bolt action has been improved even further. The bolt locks following the rotation of 22.5 degrees in the receiver. 

5. Magazine group-The magazine is made of transparent synthetic material, to allow a quick check of how many rounds are left in the magazine. The spring is non corrosive. The magazine capacity is either 30 or 40 rounds.

6.Butt Group: The butt which is of synthetic material and serves to accommodate the trigger mechanism. The two haves of the stock are inseparable connected by friction welding. 

Safety: lateral push through locks trigger movement, incorporated as part of the three position fire selection switch. 

3. Technical Data

Aug 417: 7.96 lbs
Aug 508: 8.38 lbs
Aug HBAR: 10.78 lbs

Mag empty  30 rounds .27 lbs


16 in barrel- 27 Inches
20 in barrel- 31 Inches
24 in barrel -35.5 Inches

Mechanical Features-
Rifling- 1-9" or 1-7"

Optical sight- 1.5 power optical sight with windage and elevation settings. Standard Right reticule diameter 1.8 m projected on a distance of 300 mm. ( Editors note So a 6 foot person in the cross hairs at 300 yards would be the entire length vertically from the top to the bottom of the ring reticule)

For the first time in a military and law enforcement weapon, an optical sight has been integrated into the carrying handle and is therefore housed in a fully protected fashion. The optical sight offers a magnification of 1.5 times This slight magnifications means a wide field of view 45m at a range of 300M. furthermore it is possible to fire with both eyes open (as human eyes are able to adapt themselves from 1 to 1.5 X. 

Muzzle velocity is 980 M/x or 3215 FPS. 
Circle rate of fire automatic- 680-850 RPM
Semi- auto fire approx - 150 rounds / min theoretical. 

Future accessories to the steyr aug are:

bayonet holder
bolt lock group: left ejection
Tool for sight adjustment 
special housing group to accept Nato standard scope mounting systems

Chapter II Operation Instructions 
Note: to reduce the possibility of barrel obstruction caused by defective ammunition only approved high quality ammunition should be used. 

1. Instructions
If you suspect cartage of faulty ignition or if recoil or muzzle report is not normal, stop firing immediately, remove magazine, clear chamber, locking the bolt to the rear and remove barrel to inspect bore for obstructions. 

1.1. Safety procedures- place safety in safe position by pushing catch safety to the rights. Not that the rear face of catch has a white dot exposed on the right side to indicate safe, and a red dot on the exposed when catch safety pushed to the center or left position to indicate fire. 

1.2 Controls: 

Warning for left handed shooting. See field stripping and reassembly procedures 1.8 for instillation of the left handed bolt lock and reposition of the lid ejection. 
Check whether the gas regulator is positioned with round pin aligned with small dot stamped on gas cylinder. This is the normal position. 
If operation becomes sluggish during extended firing due to power deposits in gas cylinder, the regulator should be adjusted. Push down on the two ears of "side, regulator gas and turn until round pin aligns with larger dot stamped on cylinder. Aligning pin with the letters "GR" blocks gas cylinder and weapon must be operated manually. 

1.3 The scope is factory adjusted to a 300M range with standard Nato ammunition. Windage and elevation "screws. adjusting " are marked with a scribed line on dial and rim of adjuster housings. 
Screw adjusting for windage is on the right side of the housing with direction R indication movement of point of impact to the Right. 
Screw adjusting for evaluation is on the bottom of housing with direction H on the left side indicating movement of point of impact up. 
Click- stops are provided on windage and elevation screw adjusting. 

1.4  Loading and Firing

Load 40 round magazine and insert in magazine firmly until "catch, magazine" clicks audibly. Retract "grip side cocking" with left hand and turn it inwards. Take hand off grip side cocking and press" grip side cocking with the thumb only outwards. Gun lock jumps freely forward. The rifle is loaded and on "safe" If bolt does not fully close pull "grip side cocking : back until is covers end of slide rod guide. Press in "plunger, side cocking" on top of "grip, side cocking" this will lock" side cocking" to end of slide rod guide and function as a forward assist mechanism. Fold down "grip . barrel" 

Place weapon on solder, point in a safe direction, move catch to center or left "fire position. After firing, immediately place in "SAFE" position. 

Note: Grip side cocking stays in the forward position during firing. The Steyr Aug is equipped with a magazine "catch holding open" that keeps gun lock to the rear after last round is fired. To continue firing,  insert loaded magazine, pull grip side cocking to the rear most position to disengage, catch holding open and release grip side cocking. 

1.5 Stoppage and immediate action. 

Immediate action for clearing jams. 

Note: the steyr aug will perform reliably even under the hardest conditions if given basic care and cleaning. Occasionally, however, a jam may occur which will require the following steps to clear. 

place catch safety in the safe position by pushing to the right. 
Remove magazine. 

Pull grip side cocking smartly to the rear to extract and eject defective cartridge. 
Release grip side cocking allowing gun lock group to slam forward to insure free movement. 

Reinsert magazine. Pull grip side cocking to rear and release. 

Place catch safety in fire position by pushing to the left and resume firing. If jamming reoccurs check the following table for cause and corrective action. 

IV. Dismantling and Assembling

Without the need for special tools, the Steyr AUG can easily be assembled for use or disassembled for cleaning. However, ensure that the rifle is unloaded before doing either.



At this point, the AUG has been stripped into its six primary groups.



Assemble the rifle in the reverse order of dismantling it.


At this point, the AUG is completely assembled.

Advanced Work

Stripping the barrel grip

Punch through "pin retaining grip barrel." Pull off "grip barrel." When doing so, be sure that the lid "lid, grip barrel" which is spring loaded, does not jump away. 

Take off "lid grip barrel" and "spring, grip barrel." from "grip, barrel." 

Fitting Procedures 

Introduce "spring, grip barrel" with long leg in front into "grip barrel." Put "grip, barrel" into barrel sleeve (flattened part of barrel grip pin shows toward chamber). 

Punch in "pin. retaining grip barrel." 
Suspend "spring, grip barrel" with hook in eye and pull it out to such an extent that the " lid, grip barrel" may be suspended. 
Let "lid. grip barrel" engage. The hook for the fitting of " lid , grip barrel" should be locally made of spring steel wire. Auxiliary tools are required also for disassembling the side cocking. 

Remove. install "Eliminator Flash" 

Screw off and put aside "eliminator flash"  LH thread. Then screw off check nut, put aside barrel. By means of screw driver lift spring ends of "ring retaining" out of "nut eliminator flash" groove, pull off "ring retaining." 


Screw "nut eliminator flash" on barrel to the stop position. Scow on "eliminator flash" to the stop position, then backward until the central slot on the eliminator is running in line with the optical sight on top of the barrel. The large closed segment of the eliminator will then be correctly positioned in line with the hand grip on the underside of the barrel. Complete the operation by fastening the eliminator flash with "nut eliminator flash" taking care to maintain the alignment. 

Slide " right retaining" on " nut eliminator flash" and allow it to engage into groves. 

Replacement of "piston" "ring Piston" and "spring piston" 

Removal procedure: 

Disassemble "regulator , gas, sub assembly" 
Note: do not remove "ring piston " except if damaged, then replace. Take off "rings piston" with screw driver.

Fitting procedure

Mount "rings piston" on piston. Use the mounting cone WSK-5301. Insert "spring piston". Insert complete "gas piston" and "regulator, gas, sub assembly" 

Replacement of "regulator, gas, sub assembly"

Removal Procedure

Take out "regulator gas sub assembly" Mark riveting point on "side regulator gas" by means of a pin punch in center, spot drill approximately 1.5 mm with center drill and knock out pin with pin punch. 
Remove "side regulator gas" Pull out "spring regulator gas" 

Elimination criteria: as soon as the gas plug head shows a max. diameter of 2.3 mm at the largest hold and of 1.8 mm at the smallest hole discard. 

Fitting Procedure: 

Insert "spring , regulator gas" and "pin regulator gas" in to " plug regulator gas" Place "side regulator gas" on set off pin part. Rivet "pin regulator gas". Insert "regulator gas sub assembly." 

Replacement of "plunger, barrel lock" "How to put in a barrel release pin for you USR guys!!!!" 

Removal procedure: Pull out gun lock from housing and put to one side. Screw out and throw away grub screw. "note some times the gub screw can be reused." When not easy to move "as in most cases" warm up Loctite 242 because of screw locking varnish. Take out "button, sub assembly" Remove " plunger barrel lock. Remember the grub screw turns counter clock wise unless my photo copy has been reversed.  

Fitting Procedure: 

Reinsert grub screw. Insert "button sub assembly " and "plunger, barrel lock" turn in grub screw. 


Replacement of Slide Locking 

Removal procedure: 

Punch through "pin, grip slide cocking" and "plunger side cocking" with spring upward from "body slide cocking" Pull back "body, slide cocking" and "spring coupling slide cocking" Slide " body slide cocking" from below through housing window. Punch through "pin body slide cocking" on "body slide cocking" Pull out "spring. Slide cocking " with hook. Hook to be made locally made from spring steel wire. 

Replacement of "slide front sub - assembly "

Place housing on a suitable wooden support. Punch though "pin retaining sling front." 

Take out "sling front sub assembly. 

Fitting procedure: 

Insert "sling from sub assembly , punch in "pin retaining sling front" 

Internal Picture of the AUG

Removing the "slide sub- assembly " parts or the piston. 

Removal procedure: Clamp the "slide sub assembly" or piston into a vice with corresponding clamping jaws that are shaped circular. Then unscrew the thrustpieces but ensure that springs are removed under control. If thrustpieces are difficult to remove then apply heat up to the connection points of the thrustpiece and guide rod to 250 C*. Take off " spring lock short" , "rod compensating", "spring lock long" and "plunger, spring lock" from the guide rod and put to one side.

Fitting procedure:  Put in new trust piece and screw thrust piece with a torque wrench with the correct torque setting of 20 Nm. When fitting new springs ensure the lock mechanism is inserted in a weapon and remains cocked for 12 hours. 

REPLACEMENT of "bolt sub assembly" 

Removal: Field strip the bolt sub assembly. Take "bolt lock sub assembly" and push through "pin extractor" by means of pin punch. Pull out pin punch and take off extractor. Be sure not to drop it! Remove "Spring extractor sub assembly" Place on "bolt lock" and beat through "pin retaining ejector" with pin punch 2mm in diameter. Pull out pin punch and be sure that ejector and spring components are removed and not dropped. Pull out ejector and "spring ejector " from "bolt lock." Press out " pin retaining, pin control" and push out "ping control" 

Fitting Procedures- Insert " spring extractor sub assembly" and extractor in "bolt lock" and fastened with "pin extractor." Insert " spring ejector" and ejector and fasten with "pin retaining ejector." Insert "pin control" and punch in " pin retaining, pin control." Prior to assembling the "slide sub assembly" check extractor for operation. 

Elimination Criteria for bolt- note Steyr sells a test gauge

Extractor: fracture and wear to gauge size according to WL 7915 and 7604
Spring extractor: Any cracks and fractures. 
Ejector: Fracture or no longer than true gauge size according to WL-6341
Bolt Lock- any cracks and fractures
Spring ejector: any cracks and fractures; minimum length =25mm
Spring side cocking- Fracture or gauge side according to WL 6336.
Pin firing: fracture or gauge size according to WL 6336. 

If changing the "bolt lock" testing  you will need a special gauge for that too. 

Replacement of Trigger and Sear

Removal- remove "screw trigger" pull out sear from butt to the rear. Pull out trigger from butt upward. Pull out "nut trigger" from trigger. 

Fitting Procedure- Insert trigger from above into butt. Introduce sear from the rear into butt and push forward up to the stop. Slide trigger mechanism group with cocked hammer into butt. Secure trigger mechanism group with "pin retaining sub assembly" slide sear back until rests against the "slide trigger mechanism" but does not release it. In this position turn in " screw trigger" including "washer trigger" and tighten. 

Replacement of catch safety- Turn out screw trigger pull out sear from putt to the rear. Pull out trigger from butt upward. Force "catch safety" out from butt from the left. Take out "spring catch safety." 

Fitting procedure: Insert "spring catch safety" put catch safety from the right into butt until it engages (red point in front) Introduce sear from rear into the butt and push it forward up to the stop. Slide trigger mechanism group with cocked hammer into the butt. Secure trigger mechanism group with "pin retaining sub assembly" but does not release it. In this position turn in "screw trigger" including "washer trigger" and tighten. 

Replacement of "housing lock and spring housing lock. 

Removal procedure: Remove butt. Lift of "spring housing lock" housing lock being in unlocked position- with screw driver and pull is out of the putt together with housing lock. 

Fitting procedure: Push the housing lock and the "spring housing lock" in to the butt until it engages. 

Replacement of "catch magazine" 

Removal- Unscrew "bolt magazine catch." Pull "catch magazine" and "spring magazine catch " out of the butt. 

Fitting procedure: Place "spring magazine catch" into " catch magazine. Remember to put lock tight back in! Put "catch magazine" into butt in normal position and secure with pin punch, thereby pushing the mounting bolt out o the "catch magazine." Put "bolt magazine catch" through the left side thereby the pin punch is pushed out of the "Catch magazine." 

MAKING A GUN FULL AUTO IS ILLEGAL. (want to end up like Waco Texas?)

Now for the reason why a AUG or USR will not go full auto
1. NO auto sear
2. the sear that meets the lever disconnect are a two distinct levels about an half an inch. And the sear is flush with the stock body.
3. Auto sear has its own special pin and pin holes. 

Replacement of trigger mechanism parts

Removal of Catch hold open: Remove trigger mechanism group. Push through "pin trigger mechanism" Remove "lever automatic firing"  or the disconnect in AUG-SA. Force out "pin catch holding open" with pin punch from the inside. Take out Catch holding open. 

Fitting- Reinsert "spring catch holding open" in the "catch holding open. Insert "catch holding open into "body trigger mechanism" and secure with "pin catch holding open." When inserting the "lever automatic firing" be sure that the legs of the "spring hammer right" and the "spring hammer left" come to rest in the respective grooves of the "lever automatic firing" secure with punch and knock in "lever automatic firing" secure with punch and know in " pinch catch holding open." 


Removal procedure: Remove trigger mechanism group remove " lever automatic firing" Push through "pin hammer" 

Remove hammer inclusive " spring hammer right" and "spring hammer left" Take off both springs from hammer.

Fitting procedure: When placing the "springs hammer" on the hammer make sure that the long spring legs are put in to the corresponding bores of the hammer. Further assembling is done ins reverse order .Elimination criteria for springs hammer- leg angle is not correct. Any cracks and fractures.

V. Table of Stoppages

Incorrect feeding and loading

Cause Remedial Action
Magazine is inserted incorrectly Remove the magazine, and insert
it again until the magazine catch
positively locks
Damaged Magazine Inspect the magazine, and replace
it if necessary
Dirty Magazine Clean
Insufficient Gas Pressure Align the gas plug with the large
circle to increase gas flow ; THIS
Dirty Chamber Clean
Defective or Dirty Cartridge Discard the cartridge, and clean
the chamber

Bolt Does Not Lock Back

Dirty Chamber or Dirty bolt Clean
Defective Cartridge Eject and discard the cartridge
Jammed Extractor Clean and oil


Defective Cartridge (primer is struck but fails to ignite) Maintain firing position for 30
seconds and then unload
Defective or Broken Firing Pin Maintain firing position for 30
seconds, clear and unload the
weapon, and replace the firing pin
Fouled Bolt Clean and oil
Defective Hammer Mechanism Replace the hammer mechanism

Incorrect Extracting or Ejecting

Jammed Extractor Clean
Defective Extractor Replace the Extractor
Weak Extractor Spring Replace the extractor spring
Defective Ejector Replace the Ejector

VI Cleaning and Maintenance