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The industry standard paintball size is .68 caliber. However, the standard barrel bore is .689. If you are looking for a barrel that will fit the paintball, overbore, because paintballs are sensitive to heat and moisture and they will swell up throughout the day.

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15y ago
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13y ago

very slightly largery then .685 caliber, but high end barrels can be ordered to a specific smaller or larger diameter, usually from .67 to .69.

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14y ago

You want your gun to have as little frontal profile as possible, so you dont want a very wide or tall marker.

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15y ago

One with or without a buttstock?

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14y ago

About .685 of an inch all around.

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Q: What is the diameter of a paintball gun barrel?
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