This instructional video provides a step-by-step guide on installing the Shadow Line Division NPAS kit for Tokyo Marui AKM and AKX gas blowback rifles. The process begins with the detailed disassembly of the rifle’s bolt carrier and nozzle assembly, requiring basic tools like hex keys and a small screwdriver. They demonstrate how to swap the factory rocket valve for the new adjustable components, ensuring that the specialized "shark fin" adjustment screw and valve are seated correctly before reassembling the nozzle unit.

Once the installation is complete, the video explains how to fine-tune the rifle's power output using a 1.5mm Allen key inserted directly through the nozzle. Turning the adjustment screw anticlockwise reduces the FPS by restricting gas flow, while turning it clockwise increases it. The guide concludes by showing the reinstallation of the bolt assembly back into the receiver and verifying that the dust cover is properly secured, allowing for easy field adjustments without further disassembly.