This CO2 blowback pistol is an exact replica of the famous FN Herstal Five-seveN semi automatic pistol. The airsoft version is made in Japan to exacting specifications for maximum performance. It is made of a durable polymer. The gas system is very efficient and designed to reduce CO2 consumption without sacrificing performance. The rear sight is adjustable. The gun also has a built in Baxs (hop up) system which can be adjusted to improve accuracy. Uses standard 12g CO2 cartridges (sold separately). OEM by Marushin.