Australia here - our change to gun control was well covered by John Oliver some years back but, in short, we had a mass shooting in 1996 (Port Arthur) that resulted in 35 deaths and 23 wounded, that changed Australia's mindset forever.
Our Prime Minster at the time worked with all states and territories to enact stricter laws on licensing and obtaining firearms. Yes, we've had crimes classed as mass shootings (4+ casualties) since, but nothing on the scale of Port Arthur - primarily because the change in laws reclassified semi-automatic weapons, and made them harder to obtain.
Before then, I'd shot guns with my dad - we'd enjoyed target shooting as a moderate hobby. But, aside from that, we had no other good reason to keep firearms, and my dad handed them in during the buyback scheme. We played our part in over a million weapons being handed back and destroyed, and I have no regrets. I'm now raising my child in a society where gun violence is considered rare, and I'm happy with that.