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I have upgraded the star249 gear box. First get wildmonkey metal gearbox for sure, polymer is shit, piston guide rail failed after 4000 rounds.
As for internals you can use any gear set you want, the stock gear set is pretty good though. The piston is V2/V3 however not every piston works, I tried a few systema ones and they were just a little too short and would get hung up on the side of the mechbox. (I used a VSS piston and piston head)
You can use a version 3 spring guide you just have to cut the sides down a bit (you will know what I mean when you go to install it.
Now the mechbox is long therefor you will loose 40-50fps off whatever spring you use (I'm using prometh 140 shooting about360fps)
Standard barrel so thats an easy thing to upgrade, the hop up rubber is shit, get a guarder one.
I havent changed cylindar and nozzle yet so I dont know what comparable version it is yet,
also install a mossfet
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