It falls under Section 103(i) in the Brady Law: And backs up the Second Amendment………….
(i) PROHIBITION RELATING TO ESTABLISHMENT OF REGISTRATION SYSTEMS WITH RESPECT TO FIREARMS- No department, agency, officer, or employee of the United States may–
(1) require that any record or portion thereof generated by the system established under this section be recorded at or transferred to a facility owned, managed, or controlled by the United States or any State or political subdivision thereof; or…..
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Gun Sense Massachusetts Gun Law Information and Common Sense Firearm Safety By Mark R. Shean Sr.