I believe it's legal to manufacture guns (that would normally be legal) for personal use in the United States without any permit or license or anything.
Also they're not saying the data is illegal, it just may be illegal to "export".
Also they're not saying the data is illegal, it just may be illegal to "export".
ATF agent: Oh, you got that from a torrent? Did you also seed the file?
You can see where this is going, and it doesn't have a happy ending.
If you do make one of these though, for the love of God embed a chunk of metal. These things wouldn't be legal without it (metal detectors).
Why you have to explain anything? As far as I know, you do not owe anybody to prove that you possess anything you have legally, if they suspect it is illegal they have to prove it.