There are two categories here that the grandfathering clauses cover. The first category is the CZ 858s and the Swiss Arms that were deemed to be non-restricted. There was another category of Swiss Arms that were not deemed to be non-restricted because the RCMP was unaware that they existed at the time that the order that deemed these firearms was made. They're referred to as Four Seasons arms. They are currently prohibited.
There's an amnesty order in place that protects individuals from criminal prosecution for possessing them. It has four permitted uses: disposing of the firearms, selling them to a business that has privileges to possess prohibited firearms, delivering them to a peace officer, and transporting the firearms in order to give them to a peace officer to sell them.