Just because it's coming from a dealer doesn't mean the CFO will accept the transfer. When you make the purchase, whether from a store or from an individual, the seller will initiate a transfer of the restricted firearm. You must then call the CFO to complete the transfer. Regardless of whether it's a retail sale or a private sale, the CFO will ask you for the purpose of the firearm and which club you're a member of. If you're in the process of becoming a member, say so. They probably will, but it doesn't necessarily mean they'll approve it. It sucks that it has to be this way, but that's how the Ontario CFO operates.

As for a seller delivering it to you, he or she will need to obtain an ATT. You will not.