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.

Logan Plays reviews the Specna Arms SA-FX01 Flex AEG, a lightweight AR-9 platform with a high-density polymer construction, 6.03mm tightbore inner barrel, and a pre-installed HAL¹ ETU for programmable fire modes. The HAL¹ ETU offers features like binary trigger, AUG mode, adjustable trigger sensitivity, and pre-cocking, making it a good primary for both beginners and experienced players.