And even if you run into trouble with your installation, your local gunsmith will have an easy time putting things back together. 

Note that these steps may be practiced without ordering a Trigger Tamer device.  Beginners seeking basic information about the AUG assault rifle may visit this useful site.

WARNING: The Steyr AUG has a trigger weight engineered for military duty, and to resist unintentional discharge due to accidental trigger contact and rough handling such as dropping the rifle.  Reducing the trigger weight by installing the TRIGGER TAMER device will reduce the safety of the rifle.  A rifle with reduced trigger weight should be treated with special care, and should be unloaded at all times except when prepared to shoot.  Do not transport or leave unattended a loaded rifle.  The safety should be used at all times, except when shooting.

1. Read the entire directions before proceeding, to ensure that you are confident of your capabilities to complete the job.  You will want to compare some of the later illustrations with the intact mechanism to be sure that you understand how the mechanism will reassemble.  Refer to the parts diagram at the end for part names and orientations.  DO NOT FORCE ANYTHING DURING THE PROCESS.

2. UNLOAD RIFLE.

3. Remove Trigger Mechanism from Stock.  Cock rifle.  Press dimple at center of buttpad and push in rear sling pin.  Remove butt pad.  Press protruding tab and remove sling pin.  Slide out trigger mechanism.  (If you forgot to cock the rifle, it will not come out, and you will need to reinsert the sling pin and cock the rifle before proceeding.)

4. Push the rear pin from the right.

Carefully release hammer (hold it firmly with your hand so that it does not snap forward.)  With the front of the trigger mechanism (on the right in this image) pointing forward away from you, push the rear pin to the left with a pen or pin punch.  This will cause it to protrude slightly from the trigger mechanism housing.  Do not push the pin all the way out (which will somewhat complicate the process.)  The pin may be somewhat stubborn, because the retaining pin "lock" (the tab sticking our the rear that you will be replacing with the TRIGGER TAMER device) is pressing against the pin.  To relieve this pressure and friction, press the lock forward a bit. 

5. Slide the pin about halfway out to the left.

You may barely feel a slight "click" as the right end of the pin passes the point on the right face of the lock.  You will get a strong "pop" when the pin pulls free of the lock, and the lock pops up under the pressure of the trigger spring.  STOP pulling the pin at this point.  If you accidentally pull the pin all the way out, the drop safety (that sheet metal tab sticking up at the left) may come loose, and you will need to follow the instructions below to reinstall it.  If the pin is loose in the housing at this point, it will probably fall out at some point.  To avoid this, you may use some tape to retain it in place.

6. Unhook trigger spring from lock notch.

The trigger spring has an upper leg with a J-shape.  Press down on the leg with a thumbnail so that the crossbar of the leg slides down in the notch at the front end of the lock.  This will allow the lock to fall free to the rear.  Note that the rear pin may have accidentally moved to the right back into the housing, and will need to be pulled to the correct position so that the lock can be removed.

7. Lock removed.

Note that the rear pins right end is flush with the passage in which the lock slides.  The metal drop safety's laterally-bent tab is positioned in the slot at the rear of the trigger mechanism slide.  If the drop safety came out, you will need to reinstall it in this position using the instructions below.

8. Spring leg in disconnector notch.

The straight lower leg of the trigger spring is in the notch of the disconnector.  This position must be restored on reassembly.  If the leg is not in the notch, but on the surface next to it, it will likely "walk" to the side away from the notch, and become wedged in the gap between the disconnector and the wall of the housing.  If the rear pin and drop safety remain in position, then proceed to step 18 to install the new TRIGGER TAMER device.

9. Oops, the pin came out and the drop safety came loose!

Don't worry, because it just takes a few easy steps to reinstall it.  It is possible for those with three hands to cheat and wiggle it into position without removing the slide, but it is difficult to align the attached spring legs, the bent tab, and the rear hole.

10. Remove the middle pin. 

Press it entirely out and remove it from the housing.

11. Remove the trigger spring.

Note the orientation with the straight leg down, and the bent leg up and pointing rearward.

12. Remove the slide.

Remove it fully from the housing.

13. Reinstall drop safety.

With the lower legs of the attached spring pressing flat of the floor of the housing, align the drop-safety's hole with the rear hole in the housing, and insert the pin from left to right partially into the housing as shown.  This is only a little fussy, because the attached spring will try to push it out of position when aligning the hole.  It can help to sight through the hole in the housing to know when the drop safety is in alignment.  And be sure that the lower legs of the attached spring are pressed flat on the floor, looking something like the runners of Santa's sleigh, or a kneeling bug.

14. Reinstall the slide.

Insert the front ends of the slide into the housing, and lower the rear end so that the channel receives the bent tab of the drop safety.  Press the slide down and forward.

15. Partially insert the middle pin.

With the drop safety tab now in the slide slot, align the slide's elongated holes with the housing's pin holes, and partially insert the pin so that it protrudes into the space between the walls of the housing.

16. Install the trigger spring.

With the straight leg of the spring on the left and pointing down from the back side of the coil, and the bent leg extending upward and rearward from the top of the coil, slip the coil over the protruding pin.  Be sure that the straight leg is to the left of the ridge on the floor of the housing.

17. Fully install the pin.

Press the pin home so that it is flush with both sides of the housing.  If there is difficulty passing through the housing wall, view from the side to ensure that the holes are aligned.  This is the last step required for reinstallation of the drop safety, if you were not fortunate enough for it to remain in place.

18. Install TRIGGER TAMER replacement lock.

Insert the device with the notches forward, and flat edge down.  Press down the trigger springs bent leg so that the crossbar aligns with the desired notch.  The forward notch is the same as the original lock's notch, for an approximately 9-pound trigger weight (differences among rifles will lead to slightly different results.)  The upper notch provides an approximately 6-pound weight.  While applying pressure to the spring to guide it into the desired notch, be careful that the straight trigger spring leg is in the disconnector notch.  (Illustration shows clear part; actual part is white Delrin.)

19. Finish installation.

Press the forward end of the TRIGGER TAMER device down, so that its slot aligns with the rear hole in the housing, and fully insert the pin.  Inspect to verify that the trigger springs straight leg is in the disconnector notch, that the drop safety tab is in the slide slot.  Verify that the TRIGGER TAMER lock presses forward and returns under spring pressure.  Verify that the slide shifts rearward and returns with a spring force depending on the notch selected, and that the disconnector pivots freely.

20. Reinstall the trigger mechanism in the rifle.  See how easy that was?  You are now ready for the final step:

21. Click below to order.

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