PolarStar Kythera HPA Engine for Version 2 M4 Airsoft Rifles

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  • Brand: Polar Star
  • Firing Modes: Semi-Automatic
  • Velocity Ranges: 270 FPS - 500 FPS (Measured using 0.20g BBs)
  • Operating Pressure: 60psi - 180psi
  • Compatibility: Most Version 2 Gearboxes


  • Designed from the ground up as a high performance mechanical HPA system, not a modification of a solenoid operated design
  • Patent pending valve mechanism provides excellent efficiency and consistent velocity combined with a realistic trigger pull and reset
  • Completes a full shot cycle on the trigger alone which translates into consistent nozzle movement and rapid follow up shots
  • Adjustable trigger (Weight, Length of pull and over travel)
  • Adjustable nozzle dwell/return speed
  • Easy to install system that fits into a standard Version 2 gearbox as a single assembly and typically doesn't require any modification to the gearbox
  • The Kythera has a wide operating pressure range of 60psi to 180 psi which allows you to fine tune the velocity of the system and tailor for different requirements and applications

Package Includes: 1x Kythera Engine