I think SBR's are fairly easy to move if you don't leave them an SBR. Sell in state with one stamp, or convert to a non SB rifle (just put a rifle lenght barrell on it) to sell, and have it removed from the register. I have the SB brace on it now, and it's okay. Just don't love it. Might change when I lose weight. Might get worse. Will have to see.