How is limiting you from buying a gun trivialise your property rights? Your property rights are defined by law.
Property rights come from the principle of Self Rule>Self Ownership>Owner of your acts and words.
If someone manufactures rifles they are the owners of the products.
Its true that taking away guns doesn't take away the criminal intent but not doing anything doesn't either.
You cannot take away intent. Doing, not doing, you're going to keep running headlong into the wall. Look at the uk, australian and nz statistics on crime.
If limiting the sale of firearms lowers the occurrence of mass killings then you have to ask yourself whether your right to buy guns is more important than stopping mass shootings and gun crime in general.
If it raises the occurence of all other crimes and makes easy victims of people by stigmatizing the gun instead of recognizing that the state DOESN'T define rights or GIVE rights then we might as well Nerf the world. Not a peep about the state false flag history? Not a peep about them orchestrating these mass shootings?