Be sure to explain how, if the availability of guns is the explanation for the relatively high number of murders, how it is the number of guns goes up every year, and yet the number of gun murders is about the same as it was 35 years ago.
Then, also be sure to compare the number of guns and the number of gun murders in each country. The US has 1 gun-related murder for every 25,000 guns.
THEN tell us how banning 'assault weapons' will have any significant effect on this.
And THEN tell us how a ban on 'assault weapons' does not violate the Constitution.