Prometheus Hard Piston for Next Generation New Ver.1 (AK / G36)Recommended for replacement of regular maintenance when worn or damaged !! Next generation electric gun series that produces a realistic recoil shock. While the gimmick produces a realistic and intense recoil, stress tends to accumulate in various parts. Regular maintenance similar to that of a real gun, such as loosening of each part and replacement of worn damaged parts inside, is becoming an indispensable condition. Among them, the gear and piston