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I've chronied several JG M4s so far, and they're all in the 360-370 fps range. Add metal bushings, a bearing spring guide, a new hopup rubber, a bearing piston head, and a 6.03 tightbore, and you're going to be hovering in the 380-390 range, which is more than enough for any outdoor game. 400 fps isn't the target, it's the limit. And with an M120 plus other uprades, you're going to be over the 400 mark.
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