Some news about the case law RE: split receivers
https://amp.cnn.com/cnn/2019/10/11/us/ar-15-guns-law-atf-invs/index.html
https://www.thefirearmblog.com/blog/2019/10/17/the-curious-case-of-joseph-roh/
I haven't verified this myself but it appears the article notes:
'Under US Code of Federal Regulations, a firearm frame or receiver is defined as: "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."
The lower receiver in Roh's case does not have a bolt or breechblock and is not threaded to receive the barrel, Nicolaysen noted.'
So TL;DR: for AR's, US law says the upper receiver should be serialized, but ATF has historically enforced the lower receiver instead?
EDIT: US Code here: https://www.law.cornell.edu/cfr/text/27/478.11
Ahh good point. Some background on some specifics of the cases below:They actually addressed this in the proposed rule. At least for now, they're not changing their determination as to which part of a split receiver/modular firearm is the serialized part, only updating their definition of "receiver" to be more expansive so that it ensures that at least one part of the gun is a receiver. they cited a handful of court cases where they lost because the judge ruled that NO part of an AR15 met their definition of a receiver, therefore the person being charged with illegal manufacturing and distribution of firearms hadn't committed a crime because there were no firearms. The ATF needs this one in order to make their Ghost Gun nonsense stick, because it can't be a precursor to a firearm if the end product is also not a firearm. It's a really tortured reading of everything, but as of today (obviously subject to the changing whims of our new unelected aristocracy) upper receivers would not be considered firearms and subject to serialization.
https://amp.cnn.com/cnn/2019/10/11/us/ar-15-guns-law-atf-invs/index.html
https://www.thefirearmblog.com/blog/2019/10/17/the-curious-case-of-joseph-roh/
Former ATF agent at center of legal dispute over AR-15
In his 23 years with the Bureau of Alcohol, Tobacco, Firearms and Explosives, Dan O'Kelly was one of the agency's top gun experts. These days, however, O'Kelly is using his formidable firearms expertise and institutional knowledge of the ATF to take aim at his former employer.
kslnewsradio.com
I haven't verified this myself but it appears the article notes:
'Under US Code of Federal Regulations, a firearm frame or receiver is defined as: "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."
The lower receiver in Roh's case does not have a bolt or breechblock and is not threaded to receive the barrel, Nicolaysen noted.'
So TL;DR: for AR's, US law says the upper receiver should be serialized, but ATF has historically enforced the lower receiver instead?
EDIT: US Code here: https://www.law.cornell.edu/cfr/text/27/478.11
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