Does any body used the Re Tech NPAS adjust FPS nozzle on your m4 GBB? I got question that I found two types on the Re Tech website. One is made by plastic, one is made by Aluminum. What are differences between them when using on GBB? is aluminum one more reliable and not easy got broken? or what other reasons? Any body know that.
Here is the web link for Re Tech NPAS nozzle.