In their recent review, 4UAD Smart Airsoft highlighted the Poseidon Theseus M4 AEG as a compelling option, particularly for beginners. Their unboxing and evaluation showcased the AEG's robust polymer construction and comprehensive starter package, which includes a detailed user manual. Notable features contributing to its appeal are the integrated Medusa ETU, enabling Bluetooth-based customization via a dedicated app, a hop-up mounted tracer unit, and a practical retractable stock. Internal inspection revealed a user-friendly quick-change spring system within the gearbox. Performance metrics confirmed consistent chronograph readings, a rapid 23 rounds-per-second rate of fire, and commendable accuracy at 30 meters.