You'll want to do this:
As for taking apart, http://www.mechbox.com/aegs
is the place to go. Although the MP7 link isn't working right now (I'm assuming it's because they dont' have one to take apart yet. Scour youtube in that case I guess.
The other option is not taking it apart and just using painters tape and painting it. Some people have done that with success although you apparently won't get as good of a finish as taking it apart and painting it.