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For example;
-a center ported cylinder would be for barrel lengths that are short (ie, MP5, P90)
-a 3/4 ported cylinder would be for medium length barrels (ie, MP5 SD6, M4)
-a non ported cylinder would be for long barrels (Ak, AUG, M16)
The reason for the porting is to match your cylinder volume to your barrel volume.
The reason for matching your volume is so you are not forcing more air than is needed down the barrel behind the BB. If you do, it creates a "blow by" effect, which causes an instability in the flight of the BB when it leaves the barrel.....throwing consistent accuracy out the window.
SHA DO
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