NPAS Kit for M4 GBB | Marui | Ra-Tech

NPAS Kit for M4 GBB | Marui | Ra-Tech – for your replica

This nozzle kit for GBBR replicas gives you control over the FPS of your Marui M4 Gas Blowback. The NPAS (Negative Pressure Adjustment System) regulates the gas flow through the nozzle, allowing you to adjust the power output without changing springs. Ideal when switching between different field limits or if you want to fine-tune your replica for consistent performance. This airsoft nozzle upgrade is a practical solution for GBBR users seeking flexibility in their setup.

Technical specifications

The NPAS Kit consists of an adjustable nozzle unit with a corresponding hex key for adjustments. The mechanism is made from durable metal with a grey finish. The nozzle valve is internally adjustable, with the adjustment screw regulating the gas flow through the nozzle opening. This system fits directly into the bolt carrier of compatible M4 GBBR replicas without modifications.

Compatibility and application

This nozzle kit is specifically designed for Tokyo Marui M4/AR15 GBBR models. Installation requires basic technical knowledge of GBBR internals – you must be able to disassemble the bolt. The system works with all common airsoft gases and remains reliable at various temperatures. For optimal results, we recommend periodic maintenance of the O-rings in the NPAS mechanism.

Ready to add the NPAS Kit for M4 GBB | Marui | Ra-Tech to your setup?