all that needs is a magazine extension about level with the bottom of the grip and, Im not sure about the end if thats a supressor or what, but that would have to be added and then that nerf would be just about right, short of lacking a better paint job.
Get a famas or a type 97 replica. Thats what it more resembles. Only problem is that they are both bullpups so you have to do a magazine mod. As for the extension just pick up another famas and work your magix