Handguns like ARs are named restricteds. Normal classification need not apply.
Firearms no named restricted/prohibited must be classified according to the guidelines laid out in the CC of Canada. The RCMP will will consider stockless long guns under the 26" oal restricteds (presumably as handguns), but if it is a manual action and has a non-foldable/collapsible stock from factory (ranch hand or KSG Tactical shotgun for example) it cant be called a handgun, nor can the OAL or barrel length requirements be applied.
I have had several Ranch hands, all have been NR. The Keltec KSG tactical is 21.3" OAL and has NR FRT# as approved by the RCMP.
Please research the laws and know them intimately before speaking matter of factly to someone on the intricacies of canadian firearms law.
Spreading misinformation does not help anything.