M means meters per second for that spring.
m100 means 100 meters per second = around 328 FPS.
Don't confuse that with springs that say 170% Those mean 170% of stock (stock around 280 FPS, 170% of that is 476 FPS ).
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SHÖCK
Last edited by SHÖCK; May 21st, 2009 at 13:30..
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