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I never seen all DBOYS shoot 400 FPS. Maybe up to 370-390 FPS, not 400.
JG I know can shoot up there.
But it depends what you want first.
Use for CQB or outdoor?
If you know what you're going to use it for, then you will then figure out for FPS.
Changing the plastic bushings to metal is first.
But if you want to save yourself the time and problems of doing it, buy a SYSTEMA drop in mechbox with motor done up for you. They will last longer.
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