Airsoft Mechanic GR showcased a custom-built Specna Arms M4 featuring an Artisan URGI rail system and a Surefire replica suppressor. The internal components include a Perun v2 hybrid trigger unit, an HT motor, stock gears and bushings, a UFC piston, an FPS cylinder, stock piston and cylinder head, an Ultimate tappet plate, an FPS nozzle, an M100 spring, a stock spring guide, an SHS hop-up unit, a 6.03 brass barrel, and a Quantum bucking. This setup delivers 1.1 joules of energy and a rapid-fire rate of 21 rounds per second when powered by an 11.1 volt LiPo battery.