Steyr AUG Bullpup stock mod
Modified airsoft Steyr AUG stock to meet Marauder and most PCP.
It became very easy to carry for hunting. The safety location has been changed to the original safety of Steyr AUG stock. This is the easiest bullpup stock I have ever made.
I bought the Junked airsoft JG Styer AUG stock only at $40 at local airsoft store, which is the same as Classic Army Steyr AUG.
http://www.classicarmy.com/index.php?option=com_content&view=article&id=152%3Aaug-a2&catid=52%3Aarms&Itemid=239&lang=en
The weight is about 1kg lighter than the original wood stock, the overall length is 27cm shorter than the original.
It became very easy to carry for hunting by weight as well as length. This is seriously for ladies or youth.
The major changes is safety, decided to use original safety of Steyr AUG stock.


I made the top barrel (reservoir) support mount from Aluminum, with multi-rail mount. (A friend of mine just started making this top support from hard wood. You may make from plastic also.) If you wish military spec polymer material, you can try the real Steyr AUG stock, it the conversion kit for M16.
http://www.steyrarms.com/store/
Plastic-works is the major work, then internal trigger arm beside barrel support mount.

1.Cut off top with 31mm width using razor saw, guiding Aluminum pipe (1.25” dia.- same diameter of Marauder tank, then, filing in order to fit Marauder air tank.

The thickness of plastic is about 3.5mm, need sharp razor saw as below;
2. Make reservoir mount and Mag cover.
Cut aluminum plate by 46.5 x 220mm with pressure gauge and installation screw holes, cut off trigger case. Then, attach plastic blocks to fit revervoir. 
The mag cover must be locked by Mag release-lever. When open up pushing Mag lever, you can see pressure gauge of air tank and stock installation screw.


The photo shows pressure gauge and installation screw with Aluminum plate supported by reinforced rails.
3. Make bullpup aims inside Steyr AUG stock to move Marauder trigger. You need to make/attach the trigger adapter (see photo).

4. Mounting top barrel(air tank) support and Marauder body.

The inside of stock has several rails, I reinforced those rails to stay the air tank.
5. Attached scope mount and cheek-rest(custom made). (I prefer shorter length cheek-rest to keep same position for every aiming easy.)

Note: This stock can be modified for most PCPs
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