By the way if you didnt manage to find how the pcs works a picture worths a thousand words...
Just unscew the allen nut higlighted in red circle and voila!
As for velocity, with pcs fully off and propane, I hit the 550 fps with .30g but my M24 is fully upgraded with all the goodies G&G as to offer including the freeflot tightbore barrel, and as for PCS, G&G are making a bolt for it with pcs so screw japan's law, tawain all the way baby. I got a short mag and as for capacity its a good 50-60 shot so I figured out the AICW should be around 100.