Kind of reminds me how California's assault weapon ban seems to be quite centered around how "scary" the firearm looks, and not the capabilities of the weapon.
However this should be a matter of law, not enforcement decisions.
In this situation, it does appear to me that the law insufficiently specifies what is legal, and it is unfortunate that this came down to an enforcement decision.
[1] - https://youtu.be/RkCNq9yICJ8?&t=391 [video][16 mins, but I skipped to 6m in]
Of course, the headline just says it was 'seized'. That could happen for an airsoft gun in Japan for all I know.
Given the circumstances and confession I’m guessing this guy will be let off with a warning (deferred prosecution).
Don’t fall into the “scary weapon!” trope. Thankfully I live in America where most people don’t freak out like this and we can have cool hobby projects.
Just ask yourself-- how many people are killed by coil guns each year? Stopping their proliferation strikes me as utterly useless regulatory overreach that benefits exactly no one, and deprives many a nerd of a cool hobby project.
If criminals are openly talking about their crimes on the public facing internet, I'd hope the police would go after it.