Are the back glass pieces removable?

[x-evil-x]

im trying to find the post on here from someone who swapped the front glass and back pieces but no luck.
i dont know if the back pieces are glued in or screwed in?
getting a black iphone soon and going to swap the colors.

 

[adcx64]

the glass peices on the back are part of the antenna system. I'm pretty sure they're not removable without disrupting the antenna setup. They act as windows for the signals.