Quote Originally Posted by Danimal View Post
Can you find this somewhere? Not disagreeing with you, I just looked for the specific wording and could not find anything on the ATF website either way. I would like to know for sure, because I have always thought that an AR lower assembled and sold as a rifle could not be turned into a pistol even with a complete parts build as a legal pistol. But I just can not find anything that supports that anywhere either way.
I can vouch for this, having read it myself at the time. ATF released some rulings or something like that in 2010 or 2011 clarifying what could be done with a pistol or a rifle.

Originally manufactured as a pistol? Can go to a rifle configuration and back to being a pistol again
Originally manufactured as a rifle? Cannot become a pistol, only an SBR.

Check the FFL newsletter, open letters to FFLs, and ATF Circulars and rulings in the google.