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Re:Belgian Police Say They Decrypted Half a Billion ‘Sky’ Me... by hyperman1 on Tuesday March 16, 2021 @06:24PM (#26483999)
There's a bullet list halfway here:

https://advo-recht.be/kennisbank/strafrecht/misdrijven/welke...

Some non-firearms on the list:

* Lots of types of knives, like Stilettos

* shurikens

* Blank weapons which look like other objects, like a knife hidden in an umbrella

* Clubs and batons

* Electric shockers

* Aerosol cans and sprays for self defence

* Nunchuks

Technically, anti personnel mines, flamethrowers and laser weapons might also be considered non-firearms, but I assume even the USA forbids these.

Interesting point is your medieval flail, which is probably legal as a historical ornamental weapon. Good luck explaining that one to the cops, though

Re:Belgian Police Say They Decrypted Half a Billion ‘Sky’ Me... by mminer237 on Tuesday March 16, 2021 @07:46PM (#26484742)
I believe landmines would be illegal in the US as destructive devices, although you might be able to get a stamp to buy one, not sure.

But flamethrowers and any power laser are legal without any special paperwork in almost all states.

Re:Belgian Police Say They Decrypted Half a Billion ‘Sky’ Me... by andrewflnr on Tuesday March 16, 2021 @06:47PM (#26484230)
Nunchuks are banned in a lot of places in the US, too (CA and VA at least). I think it's easy for people outside the US to miss what a patchwork of regulation we have here.