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Well the idea is to get one that best fits the paint you will be using.
There's a list of the sizes of different brands of paintballs somewhere.
If that isn't possible, I'd say a common choice for other barrels (that are one piece in design) is .685-.689...which isn't one of the options.
In the end having a barrel that's too small might break a lot more paint. A barrel that's really too big might have some worse accuracy.
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