I'm always hesitant to call this one a retro since for a 653 clone there are a few things wrong with it. The A2 lower is a glaring problem that should be corrected (and if I ever get around to making my M16A4 clone I will probably rob this receiver to do it with and replace the receiver my 653 has with another Nodak Spud lower instead. Next is one that I overlook and that's the barrel is a 16" lightweight Colt barrel. The fact that it's a 16" versus the 14.5" of the actual 653 is one I tend to overlook since I don't want to mess with the SBR routine. The last problem I have with it is that the upper is an A1 design but a quick glance at the ejection port cover quickly shows that this part is an A2 version which wouldn't be really correct here either. Nope, no doubt about it, that lower though really has to be swapped out though.
http://i137.photobucket.com/albums/q...s/DCP_1935.jpg