Wow what a detailed, well-written and fascinating response. Thank you for writing that, I thoroughly enjoyed reading it.

It would almost be worth putting #2 to the test, just to see what would happen. As you mention it would be a legal minefield.

Interestingly (and I guess this is the same in the US?), it's illegal to open someone else's mail. For sure Law Enforcement could get around that, but they would need a court warrant and you'd have to pity the judge whose desk that landed on.

The law states:

84 Interfering with the mail: general

A person commits an offence if, without reasonable excuse, he—

intentionally delays or opens a postal packet in the course of its transmission by post, or intentionally opens a mail-bag.

I think that if the package was innocuous (i.e. didn't have Jeff's Gun's By Post emblazoned on it with a drawing of a strutting Texan blowing the smoke from his revolver), then it could be tough to find “reasonable excuse" to open the package.

Joking aside, if the recipient was a known member of forums promoting hatred or violence then it could be considered reasonable to make at least a cursory examination based on "why was this package received from from there?".

It's legislation with good solid intent (IMHO), but it's so vague that it can't cover everything.

Nor yet anyway.

As we come from different nations, our feelings on the matter may differ and I don't really want to discuss that. But thank you, you've made it easier to understand the context.

So for UK firearms, you are allowed them for very specific purposes and can't ever use it outside of those purposes. You have to make your case and get a license before you can buy a gun more powerful than an air rifle/pistol. You can't carry in public, even concealed.

UK law doesn't recognise the concept of defensive weapons, so if you use one, even in self defense, and you don't have any legal context for carrying the gun in the first place, you're fuuuuucked.

Guess I'll see you again when they catch a dude printing Glock switches and ar lowers 🙄

If they prevent these kits from being sold people are just going to get them further outside legal means to get them. Punishing someone harder for the same crime doesn't fix the issue. It just makes people bitter.

Hell "ghost guns" aren't even the issue. Allowing charlatans to have whole news stations with no regulations besides being sued is probably the real issue but we'll sooner solve that issue then the gun violence issue.