The NDP leader disputed the Conservative government's contention that gun registration is an unfair, onerous requirement for law-abiding gun owners.
"I have nothing against seeing honest farmers and duck hunters be able to have their weapons," Mulcair said outside an NDP caucus meeting.
"But, you know, that honest hunter who goes out with his pickup truck, it's a registered pickup truck ... the trailer's registered and the 4X4 is registered. Heck, his dog is registered."
New Democrats "have confidence in the ability of farmers and duck hunters to fill out a form," he added.
While farmers and hunters are entitled to own firearms, Mulcair suggested there must be strict limits.
"What kind of duck do you hunt with an assault weapon? A pterodactyl?"
There's no reason a system of tracking firearms has to go "overboard," as the Liberals did when they created the costly long-gun registry and imposed criminal penalties for failure to register, Mulcair insisted.
"I think that it is possible to provide the police with the tools to better protect the public and themselves by making sure they're able to follow every gun, and it doesn't have to be the registry as it was before," he said.
"But it does have to be a form that allows the governments, federal and provincial, to keep track of those guns. That's our bottom line."
Nevertheless, an aide later took issue with the assumption that Mulcair was saying an NDP government would reinstate some form of gun registry. A registry is not necessarily the only way to track firearms and the party is currently exploring options, the aide argued.
That careful parsing of Mulcair's comments reflects how politically explosive the notion of gun registration remains, two years after Stephen Harper's Conservative government scrapped the long-gun registry.
The registry divided the country and political party caucuses, including the NDP, along urban-rural lines.
Liberal Leader Justin Trudeau reiterated Wednesday that he would not reinstate the gun registry, even in a modified form, because it's simply too divisive.
There are other ways to reduce gun violence, he said, including through the classification of restricted and prohibited firearms and through the requirements imposed on the purchase of firearms.
"Canadians are united in their desire to see less violence with guns across this country," Trudeau said. "We shouldn't be divided on the ways to do that and that's what I'm committed to doing."
The opposition leaders gave their views on the gun registry just three days before the 25th anniversary of the massacre at Montreal's Ecole Polytechnique, where gunman Marc Lepine killed 14 female students.
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