Regardless of what KA put in there, you need a ported cylinder in there for that barrel length period, breaking point where a full cylinder can work is about over 400mm I recall (somehow 470mm sits in my mind). With that length barrel and a full cylinder, you are already 30fps lower than a ported one would give you.
That statement is wrong. Actually it doesn't matter. Dont waste your money on a new cylinder. A port will give you less air, less fps. If it has a non-ported cylinder that is fine, especially if you put in a shorter barrel. Non ported is good for barrels up to like 400mm or something so if you put in a 300mm you are definitely fine. Sounds like your just loosing air between the air nozzle and hop-up chamber.
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