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Madmax can be a tad over specific sometimes...LOL
Basically...having a port in the cylinder allows the piston to go from rest (max spring compression) and build up speed before it reaches the non-ported section in the cylinder and starts to push air down the barrel.
Imagine that you have a full cylinder and a tiny short barrel (say 5cm). The piston will have barely moved before the BB is gone out the barrel....and the BB won't be going very fast. Now imagine the piston building up speed and then hitting the compression part...the BB still only has 5cm to go...but it'll be going much faster than before.
That's what the various ports are doing for you.
Depends on what spring power you're using too...
If you want to be sure you're under...just go with a Modify S90 spring. You'll be good.
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