For the OP...
See link below quote, there's a bunch of info that should answer your Q
"Uncontrolled" firearms
Quote:
(d) Low muzzle velocity/energy guns – Any barrelled weapon that is not designed or adapted to discharge projectiles at a muzzle velocity exceeding 152.4 metres per second (500 feet per second) and at a muzzle energy exceeding 5.7 Joules, or to discharge projectiles that are designed or adapted to attain a velocity exceeding 152.4 metres per second (500 feet per second) and an energy exceeding 5.7 Joules. Both thresholds of 152.4 mps and 5.7 Joules must be exceeded for the firearm to be considered "controlled". This requirement exempts firearms that fire below the threshold velocity with a standard projectile, but exceed the threshold velocity when fired with a high-velocity projectile.
Note: The term air gun is a colloquial term referring to BB or pellet guns. Such guns operate either as spring-powered, gas-powered, or electrically powered. If the muzzle velocity of the air gun is less than 152.4 mps (500 fps)/5.7 joules but still able to cause serious bodily injury to a person, it may be considered an "uncontrolled" firearm. Airsoft guns and certain types of paintball guns may qualify as a replica firearm (see paragraph 49 of this memorandum).
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http://www.cbsa-asfc.gc.ca/publicati...-2-eng.html#a4