So the Brownells "retro rifles" AR10A and B and the AR15 "prototype" are currently MD legal. Anyone have any experience with these? Looking at the reviews and forum feedback, there seems to be much excitement and a certain cool factor.
https://www.brownells.com/aspx/general/clientpage.aspx?bapid=606
https://www.brownells.com/aspx/general/clientpage.aspx?bapid=606