Welp, sounds like he’s pissing of a lot of people by telling the truth. I don’t understand the arrogance of the ATF though. It’s very clearly written in the law what makes a frame/receiver.
"That part of a firearm which provides housing for the hammer, bolt or breechblock, and firing mechanism, and which is usually threaded at its forward portion to receive the barrel."
How would changing the writing of this to include receivers composed of multiple parts make life more difficult for law abiding citizens? Not trying to trigger anyone, I’m genuinely asking