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Usually springs are rated by meters per second, so 100 mps is around 325. Which means that a m120 spring should bring you around 400fps. That is subject to variation is your airseal isn't perfect. You could get a m130 if you want to go over 400, but even that may be too hard, so I recommend the m120.
I'm too lazy to write in two languages, so English it is.
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