N.P.A.S. kit for WE M4A1

[Nevados]

Hello,

Just wondering if anybody knows where I can get an N.P.A.S. for my M4A1? it's firing a bit fast atm 400+ FPS.

Thanks in advance

[M3anMarin3]

https://www.ratech.com.tw/store/ will have it there depends on whether you have open or closed bolt system