RustySpork
Oscar Mayer Memer
Unless you've printed a gun on a 3d printer it will get caught on any functioning metal detector. The only guns that have ever been made that were invisible to them were very early Glocks and because of that Glock was forced to modify their guns so that they would set off metal detectors or be banned from the US.
Of course that assumes the metal detectors are functioning properly and it wouldn't surprise me if they weren't because the main purpose of them is just to make people feel safer otherwise they would ban any outside strollers, wheelchair, motorized scooters and anything else that wasn't small enough to go through an xray machine.
You're not forced through a metal detector though at TTC. Just walk slowly towards the no bag entrance, and when they pick someone to go through, just walk on past. It's really that simple. If you have a bag, you're almost guaranteed to get flagged to go through one.