Is it required if im just buying a BUSHMASTER XM-15 E2S LOWER ONLY?
To be able to possess or acquire a restricted firearm or prohibited handgun for collection purposes, you need to know the historical, scientific or technical features of the firearm. The Chief Firearms Officer (CFO) of your province is responsible for deciding whether you are eligible to have the firearm for a collection when you apply to register it.
<http://www.rcmp-grc.gc.ca/cfp-pcaf/fs-fd/collector-collecteur-eng.htm>