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Highest mAh J-battery, SystemA or Eagle Force motor, high speed gears and a spring to give you around 320FPS, or just keep the spring stock. Oh, of course metal bushings. That's all you really need.
Keep in mind there's really no good way of continuously supplying BBs to a P90. Lowcaps are only 68rds, hicaps blow and if you get the box mag you have to continually wind a hicap.
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