Things in Ontario also get a little hazy if it's considered a "replica" as the province has its OWN rules about that (ie. more than just federal law applies here):Imitation Firearms Regulation Act, 2000
"imitation firearm" includes any object other than a starter pistol to which section 2 applies or a deactivated firearm to which section 3 applies, if the object,
(A) could reasonably be mistaken for a firearm but is not a firearm or a replica firearm as defined in section 84 of the Criminal Code (Canada), or
(<img src='http://www.techpb.com/forum/public/style_emoticons/<#EMO_DIR#>/cool.gif' class='bbc_emoticon' alt='B)' /> is a firearm but is not designed or adapted to discharge,
(i) a shot, bullet or other projectile at a muzzle velocity exceeding 152.4 metres per second, or
(ii) a shot, bullet or other projectile that is designed or adapted to attain a velocity exceeding 152.4 metres per second; ("fausse arme à feu")
"transfer" includes provide, barter, give, lend, lease or rent. ("cession", "céder") 2000, c. 37, s. 1.
[b]Restriction re sale of imitation firearms
No person shall, in the course of running a business, sell or transfer an imitation firearm to an individual unless the individual is at least 18 years of age and presents valid identification in accordance with section 5. 2000, c. 37, s. 4 (1).
The C3 would be classified as "imitation" so it should be fine here.
I have one and Customs inspected by hand when I crossed the border so I'm pretty sure it's good here.