Well, I don't have a posted per say but I can send you a 24x36 print of an AR-15 lower receiver with all the measurements you would need to build one! I'll do it for you for $20 and it will be a crisp clean print rolled and shiped in a tube with no folds!
I also have a smaller 18x24 print of the M-16 lower receiver that will give you all the fun measurements that the moderators here hate to see posted (unless one of them ask for the info[:O]) This should be a little cheaper to copy so I can get you this for $15 shipped.
If you want both, I can do that for $30....
FWIW, the offer stands to anybody that may be interested! Just let me know so I can get enough prints done when I go!