WYSHTECH Airsoft does an overhaul of a disassembled VFC G28 airsoft replica into a high-performance Designated Marksman Rifle (DMR). The build is centered on the new Perun Electronic Trigger Unit (ETU), which is specifically made for the VFC G28 and HK417 models. He selects custom components, including a RetroArms gearbox, a Solink brushless motor, and a Lambda 6.01mm barrel, with the goal of achieving a muzzle energy of 1.5 Joules using 0.32g BBs. This setup is designed for optimal reliability and control, prioritizing an exceptionally sharp trigger response over a maximum rate of fire.

He explains the Perun ETU's capabilities, such as adaptive trigger control and programmable pre-cocking, which is essential for eliminating first-shot lag by ensuring the piston is already in the pre-loaded position. The process includes detailed technical work, such as shimming the gears, installing the electronics, and modifying a magazine to fix common feeding issues. A demo followed afterwards with a chrono test, which confirms the build's excellent FPS consistency and its targeted rate of fire of approximately 25 rounds per second, followed by a brief demonstration of the DMR's performance in gameplay.