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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.
Not saying it's your issue, just saying it's an issue to deal with. Maybe it was put in to get the fps down cheaply?
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