Can you gut a post mil and fill it with pre mil parts? Obvious safety issues, what else?
As long as I live, I'll just never understand. Why would anyone want to buy a rifle and immediately start dicking with it? You buy a "project", and do whatever it is you plan to do with it. YOU still have a non-original rifle in a non-"original" configuration. There are literally thousands of original shooters out there to be had. When I get home from work I want to shoot my guns not work on them as well. I understand to each his own. This is just my cut on it. FWIW.