Go to youtube and you'll see some videos, "KWA ERG RM4"
ERG = Electric recoil gun - has some kick to it, and with special RM4 Pmags you get the "stop bolt function" with 30 or 60 capacity (switch to toggle). (upon fresh mag, you need to slap the bolt catch in order for the gun to shoot again, neat little feature)
Finish on it is very nice, surprisingly, I really enjoy it.
10.5 CQB (One I got) - 375 average FPS Out of the box
-- downside for some is that the gun is front wired, but I have no problems with it being front wired.
++ comes with PTS furniture, and has the Electric blow back.