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.