I second rusty sniper's opinion. This is definitely an airseal problem.
Sometimes if there is a bad airseal, the gun will shoot at the same FPS no matter what spring you put in(Unless its weaker than the FPS.) For example, one of my guns used to shoot 330FPS no matter what I did(M120, M110, M140) until I fixed the airseal.
So check the hop up rubber to air nozzle area, that's usually the area.
Hope that helps
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