So how is that any different from handing over a few pounds of any other kind of scrap metal to the police?
It’s scrap metal in the shape of a gun, duh!
Just like a harmless piece of toast can be chewed into a dangerous GLBO (gun like bread object).
To be fair, depending on how they were dewatted, they could probably be reactivated by some industrious souls in the Khyber pass gun shops. Which means they’re useless in Britain. Because the British are hopeless.