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Old October 17th, 2010, 21:50   #2
Delierious Designer of Dastardly Detonations
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Join Date: Dec 2001
Location: in the dark recesses of some metal chip filled machine shop
You need a higher volume in the cylinder than in the barrel because we operate our guns at higher than atmospheric pressure. In order to accelerate the pellet, we need to have a higher pressure on one side of the pellet to overcome the atmospheric pressure on the other side.

The air compresses in the cylinder so we need exceed the barrel volume with the cylinder volume.
Want nearly free GBB gas?

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