They aren't that complicated, so if ever I want one, I'll just make my own... and if anyone asks, I'll just say that it's a mute for my trumpet, wink wink.
You know what's really weird? You can buy air rifles with suppressors permanently installed, and you don't need any kind of special permit for it.
And because they're not legally firearms, you can even get a suppressed black powder rifle delivered to your door.
Ooh, I didn't even think of that! Though, I suspect black powder would clog up a suppressor rather quickly.
2L plastic Bottle, Polyfill. a Knife and Common adhesive are the only assembly supplies needed. Fits on all models lol
I have a lathe, I can make something a little more sophisticated than that. Still, good to know.