Airsoft Chay does an assembly and configuration of an Airsoft VFC HK416D CAG gas blowback rifle. It starts with the base rifle, and that he painstakingly attaches various components. These include a Geissele-style handguard, a SureFire Scout light with a pressure switch, a PEQ-15 laser/light module, an EOTech holographic sight with a magnifier, and a mock suppressor. The video emphasizes the satisfying clicks and mechanical sounds of each part being secured, providing a tactile sense of the build.

The assembly process is detailed, showing the removal of original parts like the handguard and the orange muzzle tip before installing the new accessories. Airsoft Chay uses a variety of tools, including screwdrivers and Allen keys, to ensure everything is tightly fastened. The cable management for the pressure switches is also shown, with wires being neatly tucked away and secured with bands. The final product is a fully-equipped airsoft rifle that looks and sounds ready for action.

The video concludes with a few test shots (without projectiles) to demonstrate the blowback action and the functionality of the newly installed optics. The overall tone is one of appreciation for the craftsmanship and aesthetics of the airsoft rifle. It's a treat for airsoft enthusiasts who enjoy the technical aspects of building and customizing their gear, or for anyone who finds the mechanical assembly of complex objects strangely therapeutic.