Not only do you require a PAL to purchase and own rifles and ammo,but most military weapons or those that have any resemblance to military weapons,fall under the "bad gun" list(prohibited).These weapons cannot be owned,imported\exported,or used unless you owed set weapons before a certain cut-off time (grandfathered).
Some types or military weapons can be owned(AR family)as well as some pistols.These fall under the restricted category.In order to get restricted status,you need to do a additional test above your PAL.
check out the Canadian Firearms center's website for more info.