Pheas Airsoft shows how to take apart the Specna Arms SA-FX01 Flex AR-9 Hal ETU edition for maintenance and repair purposes. The process begins with removing the externals, including the stock, handguard, and barrel assembly, before separating the upper and lower receivers to access the internal components.

The core of the tutorial focuses on the rifle's Version 2 (V2) gearbox, which incorporates a quick-change spring system and a MOSFET. Upon opening the shell, the host inspects the internals, highlighting the good air compression from the piston and cylinder assembly, the gears, and the magnetic trigger sensor integrated with the HAL ETU.

The final section demonstrates the meticulous reassembly of the rifle, covering the often-fiddly steps of managing the internal wiring and correctly positioning the selector plate and motor. The guide concludes with the process of reattaching the pistol grip, buffer tube, and securing the receivers back together, providing a complete walkthrough for maintenance.