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The question that needs to be explored is: What does ITAR actually say?
Post that and we can parse through it.
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ITAR says that if you publish detailed instructions on how to make something that is controlled, it's a deemed export.
AR15 is a controlled item. You can't just send them overseas.
What does the USML say about it?
ML1 Smooth-bore weapons with a calibre of less than 20 mm, other arms and automatic weapons with a calibre of 12.7 mm (calibre 0.50 inches) or less and accessories, as follows, and specially designed components therefor:
So yeah, that sounds like an AR15. This extended to accurate information that would allow someone to make one as well, such as a 3D printed part file.
Under this view, the seizing of the servers would have been valid, but now it's been determined not to be.
However, since some parts aren't really suitable for military use, even if the military can use them, there's some question as to whether they should be banned or not.
Some stuff on deemed exports: https://www.shippingsolutions.com/blog/why-the-deemed-export-rule-is-so-critical-ear-and-itar
Here's commentary on the original problem: https://arstechnica.com/tech-policy/2016/02/does-it-violate-federal-export-law-if-a-website-publishes-cad-files-of-firearms/
And there's proposed changes to ITAR: https://www.ar15.com/forums/Armory/ITAR-Update/44-488536/
In a simplified explanation, the question is whether ITAR reaches as far now as it did before, and whether things that merely look like ITAR components but have been redesigned (eg, the AU-PVS-14 ) are subject to ITAR at all? Previously under the model imposed on many printable items, it would have.
Now? It's not so certain.
David