The CBC quotes the 75% support number from this poll
http://angusreid.org/gun-control-handgun-ban/
The CBC does not refer to the notes associated with the poll...
Those with more self-professed knowledge of Canada’s gun laws are more comfortable with the current procedure for acquiring a license and firearm. This group is also more likely to say Canadian gun laws overall are too strict – 37 per cent say this. Those with no knowledge are nearly three-times as likely to say the laws are not strict enough compared to the most well-informed (54% to 20%)
Some of the Angus Reid Institute’s findings are at odds with those recently released from an online survey by the Government of Canada. While the government survey found close to four-in-five Canadians saying they did not believe more should be done to limit access to handguns or assault weapons, ARI found nearly the opposite. Important methodological differences explain this and are discussed later in the report