PolarStar JACK Nozzle – CYMA MP5K-PDW – #21
The PolarStar JACK Nozzle #21 for CYMA MP5K-PDW is the platform-specific nozzle for PolarStar JACK HPA engine installations in CYMA MP5K-PDW format airsoft platforms. The JACK is PolarStar’s gearbox-drop-in HPA engine — it replaces the standard AEG gearbox entirely, with the nozzle being the platform-specific component that must match the hop-up interface of the host body. The CYMA MP5K-PDW uses specific internal dimensions that require the #21 nozzle in the JACK range for reliable BB feed.
PolarStar is one of the leading HPA engine manufacturers in airsoft. For CYMA MP5K-PDW operators building a JACK HPA conversion, #21 is the confirmed correct nozzle for this platform.
- PolarStar JACK Nozzle — CYMA MP5K-PDW, #21
- Platform-specific nozzle for JACK HPA engine installations
- Compatible with CYMA MP5K-PDW body
- Made by PolarStar Airsoft — leading HPA engine manufacturer



