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PolarStar JACK AK Gearbox HPA Electronic Pneumatic Conversion Kit

SKU: PS-SJV3-AK PolarStarIn Stock Map ProtectedPrice is map protected. Coupon(s) may not be applied to this item.

  • PolarStar's affordable and efficient HPA conversion for AEGs
  • Easy switch out nozzle makes this kit universal with a wide range of gearboxes
  • A single moving part makes the engine very reliable and easy to maintain
  • Allows you to adjust muzzle velocity substantially from 250 - 500 FPS
  • Max velocity potential varies depending on barrel length and tightness of the bore
  • Includes an on-board FCU (Fire Control Unit)
  • Adjustable cyclic rate, fire modes, and poppet dwell
  • Stabilizes the BB in the hop-up unit before firing
  • Improves hop-up performance with a wide range of stock and aftermarket options
  • Replaces your original gearbox parts with a programmable pneumatic system for enhanced reliability


In the Box

1x Jack Engine

1x FCU


Brand Polarstar
Nozzle Type AK
Propellant HPA
Material Aluminum Alloy
Color Black

California Proposition 65 Warning: Cancer and Reproductive Harm -

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