Engineering & Technical Division

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This my Tokyo Marui Gspec. This is full stock and shooting at 89m/s. I will show a step by step takedown and will also show you how to make it shoot at 96-98m/s just by changing the inner brass barrel with the PSS10 430 mm 6.03 barrel.

I will be installing the following:
PDI light bull barrel
PDI bull barrel cap
PDI barrel space
PSS10 6.03 tightbore barrel 430mm


First remove the dummy silencer (you dont have have to if you ample space). Then remove these two screws near the magazine well. after removing screws you can pull the upper assembly out in upward motion.


This is the mag catch assembly, be careful because they have a tendency to fly off and they are hard to find.


Showing the upper separated from the lower.


Now remove this screw.


And loosen these two screws, no need to remove. You just need to loosen them so you can unscrew the barrel from the barrel base.


After separating the barrel from the barrel base, you are now ready to remove the inner barrel assembly. First remove these two screws.


Also take out this screw to remove the hop-up lever.


Now we are ready to replace the TM brass barrel with the PSS10 barrel


First remove the 3 screws that holds the barrel (in green) and then the two screws (in red) to open the hop assembly


All disassembled as shown here. Just replace the barrel and reassemble it back.


Now to prepare the bull barrel, first we need to insert the barrel spacer inside the bull space. They are a little bit tight but I rubbed a few drops of silicon into the o-rings.


Then using the brass barrel I removed to push it into place


Now you are ready to insert the inner barrel assembly


Push it into place and make sure these two holes are aligned. It is where one of the screw goes. After aligning, you also need the put back the hopup lever.


As shown here you are ready to screw on the barrel into the barrel base


I suggest using a little bit of teflon tape


You can also remove the hop sticker into the new one


And install the bull barrel cap anywhere during the process


And from here it is just reverse reassembly and you have new look. In installing the 430mm PSS10 tightbore barrel you gain at least 7-9m/s. I already upgraded 3 gspec with just that barrel and it is always the case. I havent tried the pdi since I am already getting good results with the laylax PSS10.

Photos of the final look of my VSR will be posted after I out the finishing touches. I am planning to paint it and I will also post the process here so keep posted.





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