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I just noticed that you are from Austria: I'm not aware of the Autrian airsoft laws... maybe you get weaker stock springs to reduce the joule output which would explain the lower fps.
Anyhow, you should check the hop-up unit (the adjustment screw should not make more than a complete turn), the hop-up rubber, the nozzle and if the gearbox is correctly seated (it's doubtful this is the cause of the problem but it's worth a look).
Let us know how it goes.
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Valar Morghulis
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