In reality the national gun registry was overturned in 2012.
The national gun registry was a relatively recent, and according to most Canadians I've talked to was highly controversial and much ignored. It was enacted in 1993 and overturned in 2012.
Canadian Firearms Registry - Wikipedia, the free encyclopedia
Canadian homicide rates by firearm by year:
Notice the downward trend? Registry enacted in 1993...
Notice the decline slowed?
then went up in 2005? During the registry?
Down again that year... but the registry seems to have had no real effect on what was already a downward trend..
What later stats I can find are as follows:
Homicides per year:
Continuing the downward trend you see, even after the registry was overturned.
So there is no evidence to indicate that the registry had any positive effect.