airsoft/bb barrels in the US of A

Building or modifying BB, Airsoft, and pellet types of guns. Target practice only!
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VH_man
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why subtract the wall thickness X2? makes no sesne to me.......
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jackssmirkingrevenge
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the outer diameter is [wall thickness] [inner diameter] [wall thickness]
hectmarr wrote:You have to make many weapons, because this field is long and short life
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VH_man
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haha good point..........
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