PolarStar JACK HPA Conversion Kit – V2 (M4/M16)

PolarStar JACK HPA Conversion Kit — V2 (M4/M16)

The Polarstar JACK for V2 is the HPA conversion for the M4/M16 platform — the most common mechbox in airsoft. If you own an M4-pattern AEG and want to make the switch to HPA without buying a new rifle, the JACK is the most capable drop-in system available. Polarstar’s solenoid-based FCU replaces the mechanical gearbox internals entirely, delivering class-leading FPS consistency and electronic programmability.

V2 Platform — The Widest Compatibility

The Version 2 mechbox is used in M4, M16, MP5-pattern (some versions), SCAR, G36C, and many other popular platforms. Polarstar’s V2 JACK covers this entire range, making it the single most versatile HPA conversion option in the lineup.

JACK V2 Core Features

• V2 mechbox compatibility — M4, M16, and many other popular AEG platforms
• Integrated FCU — electronic fire control, semi/full auto/burst programmable
• Polarstar FPS consistency — among the tightest shot-to-shot performance of any HPA system
• No battery management — HPA powered, eliminating battery and motor wear entirely
• Dwell and ROF tunable — without opening the gun

The JACK vs Other HPA Options

The JACK sits between the simplicity of a mechanical HPA engine and the full programmability of the Polarstar F2. It’s easier to set up than the F2 while still delivering Polarstar’s renowned consistency — making it the natural choice for players who want serious HPA performance without needing to programme an FCU from scratch.

External HPA rig required. V2 / M4-M16 platforms. Professional installation recommended. 18+.