I'm planning a move soon I don't have 9 months to sit on ass and wait.You can sell them in state to another resident. Just follow the rules. I did this with a SMG and 2 older AAC cans years ago.
Once we did the paperwork and the buyer paid for them, receipt given, the wait began.
Took about 9 months and everyone was happy.
Never destroy or give to the gov.
A NFA dealer can do the transfer to them quick and you get paid quick.
I know Gables in Douglasville is always looking for NFA stuff.