The RA TechNPAS(Negative Pressure Air System) enables the FPS of your rifle to be adjusted according to different site limits and changes in ambient temperature. ... Kit fits all Tokyo Marui MWS M4 gas blowback rifles/SMG's that use a two part loading nozzle.
Specification:
Part No.: RAG-Marui-060
Material: Stainless Steel
Weight: 20g*
Compatibility: Tokyo Marui M4 MWS Gas Blowback GBB Series