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Fascinating. I searched “ATF register 5 axis cnc” and came up dry. Do you have a reference?

That's not true. Machines with enough axes to be used in firearm or aerospace machining are subject to export controls, though.

You can make firearms with bog-standard lathes and milling machines.

Shhh.

you don't need a 5 axis milling machine to build a firearm, even a modern one like an M4