Thanks guys, and my M4 is CA, and everything that should be metal I believe IS metal.
Now so far it's not 100% exact, for example the Magpul MOE grip, but I am kind of just looking for a close copy. I still need to find the back sight to replace my flip-up one, and get my aimpoint. What else could I change to make it more exact? I was also looking into getting a QD silencer, but not sure yet.