PolarStar JACK HPA Engine (M249)

The PolarStar JACK HPA Engine is an affordable, high-performance High Pressure Air conversion designed for AEGs, offering a drop-in cylinder replacement that delivers reliable, programmable air control. It’s ideal for players seeking consistent power and easier upgrades without the complexity of traditional gear-driven systems.

• Drop-in, center-line nozzle compatibility: Universally compatible with a wide range of gearbox versions that use center-line nozzles for straightforward installation.
• Programmable pneumatic system: Replaces traditional gearbox components with a precise, adjustable air-control setup for stable, repeatable power.
• Single moving part design: The nozzle acts as its own poppet valve, reducing wear and simplifying maintenance compared to solenoid-only arrangements.
• High air flow for strong muzzle velocity: Delivers greater air volume down the barrel, achieving robust performance without sacrificing reliability.
• Velocity range and adjustability: With 130 psi input, velocity can range from under 280fps up to about 500fps using a 0.20g BB; longer barrels can raise the ceiling, while shorter barrels lower it—no nozzle swaps required.
• ROF up to 30 rps: Realistic cyclic rate achievable in standard configurations, contingent on magazine quality and BBs used.
• Air efficiency: 1000+ shots from a 13/3000 fill at 1.5J with a 0.28g BB, thanks to optimized airflow and minimized dead volume.
• Comprehensive kit inclusion: Each kit includes a pre-installed Filter Fitting, FCU, Switchboard, Wire Harness, and all components needed to convert your specific rifle model.
• Flexible configuration options: Gel ball compatible configurations available; HPA Tank, Air Rig (regulator and line), and Battery are purchased separately.

With the JACK HPA Engine, you gain dependable power, precise tuning, and improved efficiency over traditional gas and gear-driven setups. The drop-in design reduces downtime and maintenance, while the single-part nozzle minimizes failure points and supports consistent performance across shots and environments. adjustable input pressure lets you tailor velocity quickly for different fields or play styles, all without swapping hardware. For players who want more shots per fill, tighter consistency, and a straightforward upgrade path, the PolarStar JACK delivers a clear, practical upgrade to your AEG build.