No I think you have it right, there are(AFAIK) no later amendments.

I think in practice that the super simply approves a centrefire silencer as part of an application on behalf of the chief, but if you just wanted a centrefire silencer on its own without a firearms certificate then you would have to apply for an authorisation to the chief.

Mind you, that SI also limits the non restricted silencers to one's which could be used only on long rimfire firearms.

I think you'd find it next to impossible to find a rimfire silencer which is capable of being used solely on rifles and not pistols, hence they are legally all restricted firearms.

Correct.

Only when used on long firearms.

Short firearms are either unrestricted (5 shot, 22lr pistols) or restricted (everything else). If authorisation for a suppressor is granted on an unrestricted firearm it 9the suppressor) is still unrestricted. The suppressor itself is unrestricted and its going on an unrestricted firearm.

Now if you put a suppressor (unrestricted firearm by law) on a restricted firearm then the suppressor does not legally, technically or magically become a restricted firearm. It [the suppressor] still remains as an unrestricted firearm just in use with a restricted firearm (the pistol). Take off the suppressor and you have a restricted firearm (the pistol) and an unrestricted firearm (the suppressor).

Forget about pistols and think in terms of rifles. A 338 is a restricted long firearm. A suppressor is an unrestricted firearm, in law, and putting a suppressor on a restricted long firearm (the 338) does NOT make the suppressor restricted, its just used in conjunction with a restricted firearm.

In short the status of a firearm cannot change the legal definition of a suppressor, nor can it's [the suppressor] use.

Hope that makes sense because I don't want to have to write the word restricted again. 😁

Works that way with most things, of that nature.

You can load 5 rounds into a restricted pistol (22lr in this example) but it doesn't make the firearm unrestricted but your retricted license covers you for both scenarios of using it as an unrestricted and restricted firearm, however load 6 rounds into an unrestricted firearm and its now restricted but your unrestricted license will not cover you for this use.

IOW a retricted license covers restricted and unrestricted. Unrestricted license only covers unrestricted. Retricted is a "higher" level of licensing (for want of a better description).

By the way thats 14 more times I've had to write that word.

You have it now.