systema M100 is 365fps, guarder M100 could be up to 390fps (their QC is shit), and the modify M100 is around 340-350
Remember all this stuff is made in China and to no organized standard. Best read a review before buying any parts.
And "working in your spring" doesn't always work. Some springs, like prometheus, come already worked in. It's safer to assume the spring will never drop in fps. And storing the gun with the spring compressed typically doesn't reduce it's strength either.
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