PolarStar Kythera HPA Engine for Version 2 M4 Airsoft Rifles, Green

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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
Polar Star
Fire Modes:
Semi Auto
Compatible with most Version 2 Gearboxes
270-500 FPS w/ 0.20g BBs
30 Day Return / 45 Day warranty

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