Question:
Is the Nazir at the end of his term permitted or required to drink wine?
Answer:
He has to cut his hair at the end of his nezirus, because that is part of his korban process, as the hair was put on to the mizbeach . However regarding drinking wine, it seems that he is permitted, as I am not aware of any requirment for him to drink wine after he finishes his nezirus.
Best Wishes