N120BD is taken. It's currently assigned to a Vans Aircraft Inc RV-12IS registered in Brighton, CO.
See the full aircraft record →A tail number only frees up if the owner deregisters the aircraft or moves it to a different N-number — and even then the FAA holds it before releasing it to the public.
N120BD has been worn before. Past registrations from FAA deregistration records:
Tails one nudge away from N120BD that aren't assigned or reserved: