its just liek a gas airsoft gun if u have ever seen one..there is a pin hole at the bottom and you use leik 1100ml greengas. i had a reuable thing for a airsoft gas glock and i could get like 40 shots at 400fps then after that it would jsut decrease slowly...not hard to fill ehtier jsut stick in the port and fill until u dont hear the gas goign in..ill prob pick this up becasue im looking for a pistol and a deagle would a good change instead of t8

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A-5, SPECOPS COMMANDO STOCK, OPSGEAR MP5 GAS THUR MAG, SPECOPS MP5 SD SHORTY SHOURD, X7 HOPPER, SPECOPS DAGGER VEST. ( ALL GUN PARTS IN OD GREEN) PROCAPS REMOTE LINE, 120CI 4500 PSI HPA TANK, E GRIPED W.A.S. BOARD