You have a GREAT blueprint of a lower on the "old"AR15.com page, but absolutely no technical info  or a link  about uppers!
None at all!What if someone wanted to know the pin locations and diameters and dimensions?.The size of the bolt carrier way in the upper?Etc.. Thats the only thing I can see missing from here and this in my opinion is the ONLY failure at this site. Otherwise its the most complete encyclopedia of AR15 stuff on the net you could possibly ask for.Do you think you could find detailed drawings or a blueprint for and upper and post it here?I think that would pretty much complete the site. Keep up the great work Goatboy!