RA Tech N.P.A.S. Kit for WE M4/ PDW / M14 / G39C / SCAR L/SCAR H/ L85/416/ P90

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NPAS stands for Negative Pressure Air System, made for WE M4/ PDW / M14 / G39C / SCAR L/SCAR H/ L85/416/ P90 Series Airsoft Gas Blow Back Rifle (Open Bolt system). 

- Adjustable Muzzle Velocity, FPS