I wish that could be easily transferred to the US...
There is no way in hell Americans will ever relinquish their firearms, it'll take a catastrophic event (or a load of black people and Muslims open carrying in Washington DC) for that to even happen. Guns are embedded in the American Psyche, in such a pervasive manner that it is absolutely impossible to get leverage on this issue.
It is actually quite sad, as it just causes a load of escalation: people want guns to feel safe, the police say they want guns to feel safe against the people who are all armed, so the police get more guns and more powerful ordnance, the people who were worried about feeling safe keep hearing shit about how the government's going to take their guns away, they see the escalation in the police, etc, decide that they need more guns to feel safe, the cycle continues...