From the Horse’s Mouth: ATF Q & A on 80% Lowers

By Robert Farago

Press Release on the legalities of converting 80% lowers into finished firearms from the Bureau of Alcohol, Tobacco, Firearms and Explosive (and Really Big Fires) [via ammoland.com]:

1. Is ATF aware of the receiver blanks, commonly referred to as 80% receivers?
ATF routinely collaborates with the firearms industry and law enforcement to monitor new technologies and current manufacturing trends that could potentially impact the safety of the public.

2. What is an “80%” or “unfinished” receiver?
“80% receiver,” “80% finished,” “80% complete,” “unfinished receiver” are all terms referring to an item that some may believe has not yet reached a stage …read more

Via:: Truth About Guns