RA New version NPAS flute valve for RA aluminum NPAS nozzle for WE M4

New version NPAS flute valve is now adopted in 
RA aluminum NPAS nozzle(for WE M4, M16, 416, 888, T91 AR GBB, KSC/KWA M4 GBB) for better and more stable performance.

for RA Aluminum nozzel with tool Adjust NPAS set

for RA Plastic nozzel with NPAS Adjust tool set