New version flute valve for RA aluminum NPAS nozzle (for WE M4, KWA M4)

Specification:
New version NPAS flute valve is now adopted in :
RA aluminum NPAS nozzle(for WE M4, KSC/KWA M4) for better and more stable performance.
For RA Aluminum nozzel with tool Adjust NPAS set.
For RA- Plastic nozzel with NPAS Adjust tool set.