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The Modify 90 spring (with bearing spring guide) puts out between 320-330fps in the few guns I've installed it in. The Modify 100 (with bearing spring guide)puts out around 370fps in guns I've installed it in. All depends on what environment you want to use the gun in I guess, indoors or outdoors. Nothing wrong at all with using a 330fps gun outdoors loaded with 0.28g BBs, it actually works VERY well, even out to 150ft (my MP5A for example).
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