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Old February 16th, 2009, 01:13   #2
Official ASC "Dumb Ass"
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Join Date: Jan 2008
Location: Scarbrah, Ontario
the inner barrel is the actual 6mm barrel that the 6mm BB passes through, the outer barrel is what goes around it and is made to look like the actual barrel on the gun that the aeg/gbb is meant to replicate.

Tightbore inner barrels are available that are a smaller diameter, in order to provide a tighter seal and achieve better accuracy as well
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