I've heard that using the stock valve from a KWA MP7 also gets the fps to 320-330. This is the plastic valve that the KWA MP7 uses. I believe the KSC Taiwan MP7 uses a metal one which shoots harder.
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H&K G36c (KWA) / Glock 18c (TM) / Kimber LAPD SWAT Custom (TM) / Mossberg M500 (ACM)
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