Looks like previous evaluations of similar parts were judged by the ATF as "not a machine gun". The article has links to the documents. Crump said in his video that the parts had to be machined or shaped to a certain extent before it was to be judged a machine gun.
This.
BATFEces has contradicted itself so many times over the years that it's become the default
modus operandi. Fortunately we now have Bruen and a couple other cases which seem to indicate SCOTUS is currently operating under Strict Scrutiny provisions, at least for 2A cases. It will be hard for BATFEces to argue "We mean it now but didn't mean it before", especially when their previous approval contained detailed technical reasons why. Under those very reasons, Strict Scrutiny clearly shows AKC does not meet the unambiguous technical definition of an MG. Does it come right up to the line? Yeah, hard, and with questionable intent, but it still hasn't crossed it.
Brad