Here's one of my responses in an older thread. I've basically done the research for you.
NB: "deactivated firearm" by the definition in the document covers paintball, airsoft, and pellet guns (.177 cal and 4.5mm).
Quote:
Restriction re sale of deactivated firearm
(2) No person shall sell or transfer a deactivated 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. 3 (2).
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Source:
http://www.e-laws.gov.on.ca/navigati...browse&lang=en
(That's just the search box since the results are based on "sessions" so the results are unique to each person/search).
NB: Elsewhere there isn't technically any such rule however most stores in other provinces generally do follow those kinds of established rules/procedures.