Green Gas 130 PSI high pressure Features: 760 ml capacity 130 FPS Choosing the right gas for your replica is essential; too strong and you do permanent damage, while too weak and you get poor performance. Swiss Arms has been the point of reference for many players for years thanks to its reliability, performance and uncompromising security. Now, Swiss Arms has expanded its range to offer a more varied range; For all-plastic guns, we recommend using Swiss Arms Light (110 PSI), while for most guns Green Gas or 130 PSI gas would be used. Heavy gas is designed for GAS rifles and is not recommended for pistols unless reinforced.