The mount replaces the outer barrel entirely by fixing the inner barrel and hop up chamber to the frame at two points (front barrel contact, chamber secured by take down pin on the slide catch), rather than only the one point at the hop chamber and having a floating/tilting fake outer barrel with a slide to barrel lock up. That should theoretically improve accuracy, but I haven't done much testing. It's probably imperceptible, really.
The mount attaches via the pic rail on the MEU frame dustcover. If the 2011 frame has similar dimensions, I don't see any reason why it wouldn't work. The main issue is if whichever slide you cut down has the appropriate length to fill out the gap from the mount and the frame, while still having material to retain the recoil spring bushing.