Actually, what gives gas guns their impressive range is joule creep compared to their FPS when using heavy BB’s. Accuracy comes from a good hop rubber.
KWA can’t utilise the gas advantage because their hop design couldn’t lift a dick in a strip club. This chamber fixes the issue of the lousy hop and lets the gun perform. I still wouldn’t touch a KWA product for as long as I live though. Too many bad experiences.. even with an airsoft engenuity touched one.