I'm definitely concerned about any gun being banned that hasn't been proven to have been converted to full auto in Canada before. This all amounts to preventitive enforcement, AKA potential thought crime, the way it is being handled now.
The idea of a gun being banned because it is 'readily convertible' stems from an old case called Hasselwander. When the judge created the concept of readily convertible, it was in the midst of a case where a regular cop, not a gun smith, was able to convert a firearm into full auto right there in the court room with a custom made part that was found in the possession of the accused.
The qualifier of 'within a relatively short period of time, with relative ease' was not really quantified, but looking at the facts in that case, it should be taken to meant in mere minutes, with simple or no tools, by an ordinary person.
Contrast that with R V Sinclair, where a gun was found NOT to be readily convertible, despite the RCMPs claims to the contrary, because RCMP gun smiths were unable to obtain the tools and parts required either from their extensive gun collection or from the manufacturer, or in one case, where it took them hours of work and custom machining with uncommon tools.
The problem with readily convertible, not being statutorily defined, is that the RCMP have been able to slowly expand the applicability of that phrase, and gun owners have let it go on unchallenged. Remember that the last great john browning once converted a lever action to full auto just to prove that it could be done.
Its certainly true that with enough time and resources, anything can be made full auto, but no judge would agree that infinite time and resources meets the 'readily convertible' doctrine.
If you agree that full auto should be prohibited, WHICH I DON'T, then the readily convertible doctrine can make sense without it being likened to thought crime.
If you have a standard AR with a semi auto only receiver and trigger mech, that gun is not readily convertible. Sure you could mill out the receiver and obtain a full auto trigger group, but thats not really going to happen in a relatively short period of time with relative ease.
Now if you have already milled out your receiver, and are in possession of the full auto trigger kit, and it simply isnt installed, then its pretty fair to say that this gun is readily convertible.
Personally, rather than charge with possession of a readily convertible prohib, they should charge you attempting to manufacture a full auto, but thats a harder case to prove and the Liberals and RCMP are just lazy.