Is this a legal way to do it? If it is, it is a great idea.
It is absolutely within the Law as written, and other individuals have done this in the past. While that's not always an example to follow since they have their own set of Regulations (
SOR 98-210), gun dealers usually operate this way, having their out-going mail picked up at the store without an ATT.
When you do a transfer the CFC representative will likely read from the script: ‘Remember, when you get notification you'll need to call for an ATT.’ Just tell them ‘No need, I'll just package it and get Canada Post to pick it up at my door.’ See if they put up a fuss; though not contrary to any law, they sometimes don't like people doing things differently from everybody else.
Canada Post will treat you as a small business if you sign up for the free VentureOne™ card, and pick up all the crap you sold on eBay at your house. You can purchase and print the mailing label on-line, and pack up the gun, all without leaving your house. Technically you can't bring the box past your door's threshold while giving it to the postal carrier, but by the
CPC Act, as soon as you hand it to ‘a person authorized by the Corporation to receive mailable matter,’ it is considered
in post and no ATT is required.
You can also get packages picked up for delivery by UPS or CanPar, but likely need an actual business account with them, never mind that only Canada Post is mentioned in the
Storage, Display, Transportation and Handling of Firearms by Individuals Regulations (
SOR 98-209 S.16).