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What is it about PDI springs that kill mechboxes anyways?
That being said go with a Systema or Madbull M120 spring. A silent head set is a good idea since you're running it in a V2 mechbox.
I gave guarder infinate torque up gears and you'll want halftooth piston. You may or may not have to shave down the trigger post to fit these!
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YANHCHAN'S AIRSMITHING: AEG repair/Tune up/Upgrades V2/V3 mechboxes, rewiring/reconnecting.
Ask not what your country can do for you; ask what you can do for your country ~John F. Kennedy
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