NPAS valve or pressure regulation system.
Allows you to adjust the output power of your replica (FPS / JOULE).
It also increases consistency shot-to-shot.
For KSC / KWA MP7 series and similar, and all GBB SYSTEM 7.
N.B. Although it varies by model, the general rule allows you to adjust the GBB weapon both above and below the factory settings.
N.B. SPRING in picture is NOT INCLUDED
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