Before we get too far down this sideroad, our american chums will just have to accept that for various historical reasons and for more recent events - us brits have never had a love affair with the gun (I think it's because we lack a "west"). We don't like them, we don't want them*. Expect for a very small group of people such as farmers and target-shooters, a vote to totally outlaw the use of firearms would have no problem at all passing.
* There is an argument about freedom that can be made but we as a
society have decided it's not want we want to have.