BY LAW, they are NOT firearms, and cannot be controlled. At SOME point in the manufacturing process, they become controlled items- Just stop ONE step short and finish it up by hand.

How does it work that because something isn’t a firearm it can't be controlled? If stopping one step short isn't enough, stop two steps short. There are always going to be some people who can hack their way round anything, but not too many.
............
Anti-gun propaganda? Well, where I live we've a culture which is decidedly suspicious of guns,so if I take in our mainstream broadcast or print media it all probably would count as that. So here’s a specimen challenging the notion n that the NRA is other than hostile to sensible reforms, including some you indicate you'd like to see, Bruce - From The Guardian