While browsing Gunbroker I noticed there were some rifles listed as "preen" that were priced fairly high, especially in this buyer's market. Even more remarkably I noticed that they were receiving bids. That's when I figured out they were being purchased by people in states where older guns are grandfathered. I have a gun built on a lower I bought in 1991 that I would like to sell--gets me some $$$ and allows people in occupied states a small taste of freedom. Win-win. I have learned from previous questions that to ship it as a rifle (and not pay overnight rates) it has to travel with a 16"+ upper attached. That's fine, but the upper it was built with just happens to be the only A1 I own and I would like to keep it. So here's the question: are there any state laws that would prohibit selling a preban lower with a new upper and calling it a preban rifle? To my mind since the lower is the gun this wouldn't matter---and the new upper is essentially just a replacement barrel---but "to my mind" isn't a legal standard. Can I sell a preban gun to a ban state with a postban upper?