The term "prohibited device" is what the law attaches to such things- whether they be "silencers" or AK-47s or 'replica' BB guns or switchblade knives- and they all carry the same potential legal penalties (yes, despite the fact a 'replica' BB gun is nowhere near as potentially harmful as an AK-47- you can be locked up for either for years). It's the old "flexible Canadian law" at work- be vague about something, then make a list of things that fall under this law (part of the Criminal Code of Canada), and leave it open-ended so anything can be changed at any time (typically by adding items to said list, not removing them).
In any event- discussing the technicalities of devices which are flat-out illegal for essentially everyone (excluding the military and specialized police divisions) in an online forum oriented at Canada/Canadians is just plain asking for trouble- for everyone.