When we say “brace yourself,” we’re not kidding. The pistol brace rule is coming as well. But first, a different sort of crackdown was unleashed on the nation this week, as an ATF rule published on April 26 finally took effect on Wednesday. The regulation is entitled “Definition of `Frame or Receiver' and Identification of Firearms.” That rule is so cumbersome, complex, sprawling, and indecipherable that ATF was forced to publish an update to the “final” version on Monday, admitting: Due to the complexity of this rulemaking process and the resulting significant number of comments and revisions in response, the final rule inadvertently contained some technical errors in the regulatory text that this document corrects.  

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