The measure is considered an “administrative action,” much like executive orders used by presidents in the US as a means to circumvent the constitution and checks and balances in government.  Such direct restrictions are often subject to extensive legal obstacles and, at least in the US, can be ignored by states and the public at large (as we witnessed with the covod mandates over the past two years).

https://www.zerohedge.com/political/justin-trudeau-uses-administrative-action-ban-all-handgun-sales-canada