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PolarStar JACK M4 HPA Airsoft Drop In System for V2 Gearbox
JACK-M4 PolarStar JACK V2 M4/16

Price: $315.00

Availability:: Usually Ships in 24 to 48 Hours
Product Code: JACK-M4


PolarStar JACK M4 HPA Airsoft System for V2 Gearbox


  • Operation: HPA
  • Gearbox: Version 2
  • Velocity: 280fps - 500fps
  • Range: 200+ Ft
  • Ammunition Size: 6mm/8mm
  • Ammunition Weight: .20g/.25g/.3g/.4g
  • Build Material: Metal/Plastic
  • Color(s):Black
  • User selectable Semi/Full Auto, Semi Auto Only and Variable Burst modes
  • Independently adjustable velocity and cyclic rate.
  • Easy to use Fire Control Unit (FCU) with LCD display and five position joystick.
  • Instantaneous trigger response. Faster than an AEG with a Li-po!


  • PolarStar Jack
  • FCU board
  • Airtube to hook up with the tank airtube


PolarStar has made a miniature version of their fusion engines. The small light weight HPA system allows you to drop it in to your gearbox and take out the unnecessary parts and you are good to go. Also the JACK has the same ECU as the higher end PolarStars. It allows you to change the RPS and even the fire modes to what you desire. (Such as burst mode). If you were wanting to try out PolarStars fusion engine but didn't want to pay the price for it I highly recommend picking up the PolarStar JACK!

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