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You dont need a bigger cylinder. Just swap out the barrel and you are good to go. I have the exact same gun as you. As for ICS internals......i wouldnt rely on them too much. My gearbox cracked towards the front and the tappet plate died. But the Spring guide (it has ball bearing stock), piston and the gears are okay.
As for upgrades, I used a mix of stuff to upgrade it and so far they all work. So you dont need to get ICS OEM parts. Hope this helps. And if you have other questions you can PM me; i can give you the list of stuff i modified.
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