Yes, if you have a very long barrel, and you go with a tight bore, you might nead a bore-up kit for your piston, but it's probably not going to be an issue with your P90, so I wouldn't sweat it too much. Also, if you're going with those kinds of upgrades, you might consider sticking with the 9.4V battery. It'll crank it easier, and you won't lose as much ROF as you would with an 8.4V.
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Ubique Quo Fas et Gloria Ducunt
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