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390FPS is stock FPS for a JG box.
Try to use a chrony first just to make sure how much you're shooting.
If the FPS is too low to your standards, and you are on a tight budget, then upgrade the spring and switch up the plastic bushings to metal. You can do it yourself, takes a couple of tries, but it's better to give it to the gun doctor, or let the gun doctor open the mechbox up for you, and you see how it's beingn done, then you try it yourself in the future.
Systema Mech box would cost around 200$ or maybe less, and if it's including the turbo motor, it would cost around bit under 300$.
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