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As suggested, check that the inner barrel is not twisted inside the hop up unit. You shouldn't have a spend a dime to fix this.
For the FPS issue, you should be able to run that 120 spring simply on a standard 9.6v battery. Try to find 3600 mah or greater. It currently sounds like the spring is backwards, but check your compression too just in case.
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Chairsofter extraordinaire
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