PolarStar Airsoft Jack V2 Electro-Pneumatic Gearbox Conversion Kit for G&G SR25

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  • Manufacturer: PolarStar
  • Construction: Aluminum / Delrin
  • Firing Modes: Semi / 2-9 Round Burst, Semi / Full Auto, Semi Only
  • Muzzle Velocity: 500 FPS w/ 0.20g BBs at 120 psi
  • Compatibility: G&G SR25
  • Power Source: HPA via remote air rig
  • PSI Operating Range: 40 PSI - 130 PSI (Do not exceed 130 PSI, otherwise damage may be done to your internals
  • Rate of Fire: 1 - 30+ FPS (Adjustable)
  • Nozzle Type: G&G SR25
  • FCU Battery: 7 - 10VDC w/ JST Connector Recommended (Not included)


  • The Jack uses a tried and true, blow-forward, open bolt design which delivers solid performance and reliability while also providing outstanding air efficiency
  • It's one piece delrin nozzle is the only moving part in the system and features an integral hybrid spool/poppet valve which is capable of providing high air flow both consistently and efficiently
  • Universal cylinder design interfaces with AEG gearbox shells for compatibility with most center-line gearbox versions
  • Single solenoid driven system is controlled by the fire control unit which allows for semi-auto, full-auto, and burst modes to be assigned to either selector position
  • Optimized flow profile, firing point, and flow path promotes superior shot consistency and accuracy
  • Auto switch mode allows for proper selector configuration for specific models
  • Easy to use mini fire control unit with LCD display and five position joystick that helps saves space
  • Instantaneous trigger response that is faster than an AEG with a lipo

Package Includes: 1x Jack Conversion Kit