Stu of Patrol Base features the Delta Armory ETU Series in this episode... "The Delta Armory’s new ETU series, “Fully Upgraded - No Compromises,” is distinguished by its comprehensive upgrades and near-complete Electronic Trigger Unit (ETU). It boasts CNC 16:1 gears, a CNC piston head, nozzle, stainless steel cylinder, and spring guide, a high-torque motor with strong neodymium magnets, a full metal teeth piston, and a precision 6.03mm barrel.

The Delta Armory M4 M-LOK 13" ALPHA ETU AEG gets to be scrutinised by ASG Olsztyn. The ALPHA series is a full metal airsoft gun with a CNC Type A trigger, unique serial number, and 22mm RIS rails for attaching accessories. The stock is well-handled and battery insertion is convenient. The adjustable rear sight is mounted on a RIS rail and the barrel has a 14mm left-hand thread. The gun has a 13-inch (33cm) metal M-LOK handguard.

4UAD Smart Airsoft's ASMR episode shows an Arcturus Airsoft PP19-01 AEG that has been upgraded with Zenitco parts externally and a Perun Airsoft ETU internally. The process begins with the unboxing of the PP19. The PP19 is then carefully taken apart to expose the gearbox. The sensor is tested to ensure it's functioning properly before the gear shimming process begins. The piston is installed with precision, after which the box is securely closed. The Perun ETU is then set up.

Another ASMR session with 4UAD Smart Airsoft with an upgraded CYMA MP5K. The process of upgrading the MP5K airsoft gun in this session involves several steps. First, the gun is taken apart and the gearbox is removed. Next, the sensor is tested and the wire is trimmed to fit the gearbox. Then, the sensor is double checked and the gears are shimmed to ensure smooth operation. After that, the piston is installed and the gearbox is closed.

LCT Airsoft got this short video showing their AEG gearboxes being equipped with electronic trigger units or ETUs which are becoming standard in AEGs these days. They show four leading makers of ETUs with one being AceTech from East Asia whilst the three, Gate Electronics, Perun Airsoft, and Airsoft Systems are based in Europe.

LCT Airsoft has announced their Evolution, AEGs with built-in E.T.U. systems. This system was developed in collaboration with leading MOSFET manufacturers in the airsoft market, including GATE Electronics, Perun Airsoft, Airsoft Systems, and AceTech. The new system offers a more stable and responsive field and gaming experience while also protecting your airsoft gun. For more information about this product, please visit the LCT official website.

4UAD Smart Airsoft's latest ASMR sessions covers the Arcturus AK-12 With Jefftron ETU & ADV brushless motor. The AK12 is taken apart to remove the gearbox. and gets fitted with the Jefftron ETU and follow the Jefftron Sticker Tips. Next, a test of the sensors and shim the gears before installing the piston and closing the box followed by the installation of the ADV Brushless Motor and pair the selector. From there, it's the assembly of the rail and barrel before conducting a final test and mag dump.

Time for another ASMR session with 4UAD Smart Airsoft as they put together an upgraded SIG 552 AEG from ICS Airsoft by equipping with a DV Brushless AEG  motor and adding a Jefftron ETU. As for the suppressor mounted, it is the RGW suppressor. Watch carefully the installation which includes a mag dump to check how it performs. Just try to stay awake as ASMRs usually lull us to sleep.

West Coast Airsoft Servis (WCAS) from Slovakia reviews Delta Armory ETU series if he can recommend this series to his viewers... "WCAS review of the Delta Armory ETU series, where I dissected the weapon in every detail and pointed out the things I like and don't like. Then a minor upgrade and tuning that every weapon needs."

L'antre Du Dingo tries the Eshooter Kestrel V2 ETU bluetooth if it is something that he wants installed on his AEGs. Made for the standard Tokyo Marui V2 Gearbox, it is feature packed with pre-cocking, adjustable trigger sensitivity, battery protection, active breaking, ROF control, and more. It comes with an app to do the setttings via bluetooth.