I built one on an SP1 lower. Found a Colt A1 large hole upper with fwd assist and brass deflector. It also now sports an M2 with carryhandle mount not shown in the picture.
[url]http://www.printroom.com/ViewAlbumPhoto.asp?userid=al762fmj&album_id=71627&image_id=68[/url]
Did the true C7s use a slightly shorter trapdoor buttstock, like the aftermarket ones being sold by Coal Creek? I just threw a standard A2 stock on it.
Here is my former C8 carbine, recently turned into another M4
[url]http://www.printroom.com/ViewAlbumPhoto.asp?userid=al762fmj&album_id=71627&image_id=67[/url]