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ok kool because im getting a clasic army here soon and i already have an ics (both mp5's) and i was gonna either leve the ca motor in or swap em. i want the ca to be my main gun. and i plan to get a bore up cylender from systema and posibly a 120% or 130% pdi spring. witch brings me to my next question. i plan to replace the barrel but shoul i go with a 6.03 or a 6.04? i would immagine that a 6.03 would be better or is it to tight of a barrel? thanks
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