Fusion Engine HPA Drop-In Kit M249

The Polarstar Fusion Engine™ is a highly proven HPA system for airsoft, originally released in 2011 and awarded as the “Best HPA Engine”. This third-generation drop-in kit replaces the standard AEG gearbox with a CNC-machined, lightweight aluminium chassis. It features a dual solenoid closed bolt system, allowing independent adjustment of the poppet valve and nozzle for precise control over loading time and air volume. Performance specs include a velocity of 550fps (0.20g BBs at 120psi) and a rate of fire of 30+ rps. The system is highly modular, supporting nozzle swaps for velocity changes and internal adjustments for improved air efficiency. Package includes the complete drop-in engine.