That's a big difference actually.
Also, the type of firearms owned are different. In Canada, firearms are mostly for hunting whereas in the United States, they are mostly for protection.
In Canada, less than 12% of firearm-owning households have hand guns whereas it is at 72% in the U.S. In Canada, 95% of firearm-owning households own long guns. Long guns are more inconvenient for committing crimes or murders than handguns.
https://www.pewresearch.org/social-trends/2017/06/22/america...
https://www.justice.gc.ca/eng/rp-pr/csj-sjc/jsp-sjp/wd98_4-d...
According to these statistics USA has only almost 4 times as many guns as Canada, suggesting that to a large extent "people kill people".