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  • gearbox with the electronic control unit
  • allow to shoot in either, Semi / Burst, Burst / Full Auto, or Semi / Semi as well
  • version 2 gearbox, will fit in MOST brand M4 AEG
  • as all gearboxes are relatively the same shape and size

ARES Complete Gear Boxes Rear Wire w/ ECU GBE-002

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