![Polarstar Jack V2 Conversion Kit For M4/M16 - Standard FCU - airsoftgateway.com](http://airsoftgateway.com/cdn/shop/products/main_fee5e55a-3428-477d-8976-d5c1e53b3d1a_{width}x.jpg?v=1579581038)
Polarstar M4/M16 Jack V2 Conversion Kit - Standard FCU
The patent pending JACK™ system was designed to answer the demand for an affordable, high performance HPA (High Pressure Air) conversion for AEG's. The system is a drop-in cylinder replacement that is universally compatible with a wide range of gearbox versions that have center-line nozzles.
Similar to its sister product, the F1, it replaces the original gearbox components with a programmable pneumatic system allowing for higher performance and greater reliability over a gear driven system. Although economically priced, JACK™ still retains the same performance and quality you have come to expect from PolarStar products.
Switchboard are already available or in production for a wide range of models with even more on the way, including:
- Version 2
- Version 3
- ARES Amoeba
- Elite Force HK417
- Elite Force Tavor (S&T)
- ARES V2/V3
- Plugboards for machine guns or custom installs