.50 cal ammunition is not presently prohibited in Canada. Several .50 calibre firearms were prohibited by order in council but many have been made and designed since that are not prohibited. Incidentally deactivated firearms are not classed as replicas. For more information on this subject you may wish to visit www.nfa.ca (National Firearm Association website - check the links) and there are some good discussions on www.canadiangunnutz.com (Discussion board - much like this one -some excellent info, some dubious like any other). See also the Criminal Code Part 3 the Firearms Act and The Fireams Act Regulations.
There are no longer any valid "FACs" in Canada. All that is available to new applicants are PALs - or possession acquisition licences. As earlier stated tests can be taken for restricted and non restricted licenses. There are folks in Canada that can own full automatic and converted automatic, but they had to already own them at the time the law changed. There would be no legal full auto owner in Canada under the age of 43 as of date of writing, and most are older than that.
