The US Supreme Court on Monday barred two Texas-based manufacturers from selling products that can be quickly converted at home into firearms called “ghost guns”, granting a request by Joe Biden’s administration to once again block a federal judge’s order that had sided with companies.
The justices lifted Fort Worth-based judge Reed O’Connor’s 14 September injunction barring enforcement of a 2022 federal regulation – a rule aimed at reining in the privately made firearms – against the two manufacturers, Blackhawk Manufacturing and Defense Distributed.
They can sell parts of a firearm, for instance something like an 80% lower, that may not be regulated the same way as an assembled firearm. They can also sell files if they wished, to print or mill firearm parts.
Still depends on UK laws, sorry I'm not familiar with them past (at least I think) the full ban of handguns.