I wonder how well this will work out. IIRC, weapons like the M14 rifles, CZ58 rifles, various SIG 550 variants, the SKS and many many others are unrestricted. So they don´t know who owns them, because once you have your license, they could be bought freely in unlimited quantities. The AR-15 however is a Restricted weapon in Canada and thus they probably know where all the legal ones are.