I don't think provinces really have that much control over gun policy? That's more federal.

While you’re correct that firearm policies & the Canadian Firearms Program is associated more closely with the federal government opposed to individual provinces however, the sale of goods and services and property rights have historically been left up to the provinces to decide, it’s unusual for the federal government to outright prohibit thousands of items that have been 1) approved by the RCMP and 2) for sale in this country for decades without registration (except in Quebec, all firearms must be registered upon sale).

Saskatchewan found a nifty loop-hole in the firearms act, essentially government employees can posses prohibited firearm so long as the province approves it, so Saskatchewan appointed a firearms commissioner who’s job is to hire firearms owners, firearms owners enter an agreement with Saskatchewan government that they will sell their firearm to the federal government after they receive what is to be fair market value, this allows firearms owners to hold onto their firearms indefinitely until the federal government pays them for what it’s actually worth.