PolarStar Kythera HPA Engine for Version 2 M4 Airsoft Rifles

Specifications: 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 Features: 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 requiremen