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Use youtube to help with disassembly and Mechbox.com. For 350 fps, you should be using m90 (330 fps) spring and a tightbore. That should get you close to 350 but still staying under. M100 should be around 360-370 depending how good your airseal is and what barrel you have. A longer barrel will increase the fps a bit so does a tighter barrel. Get access to a chrono to confirm.
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