The 80% AR pattern rifle lowers are prohibited but the 80% pistol frames never were prohibited. The new classification is "restricted" and you now must provide us with a valid RPAL before purchasing. Its treated much like ammo, where we validate your license before we can process your order.
Because the frames are 80% finished, they do not have a serial number so they do not need to be registered and transferred to you at the time of the sale.
As the owner and builder of the firearm, you would need to contact your local CFO once you are ready to apply the serial number and they will provide you with the protocol for serializing and registration. This is the reason you need the RPAL to purchase the 80% frame. It is expected you will build the firearm and will then be in possession of a restricted firearm which will need to be registered with the RCMP.
Hope this helps.