So what you’re saying is that if you could somehow prove that the device isn’t designed to be used on a firearm, then you’d have a strong argument that it isn’t legally a silencer?
If you could prove that the device isn't designed to be used on any sort of a "projectile dispenser" then you'd have a pretty strong argument. For example, if you could show that the device is a lawnmower muffler and can't be used as a silencer for a firearm without being adapted to work, or if you could show that the device is a commonly available oil filter for a car and there's no intent to adapt it to reducing the report of any sort of a projectile dispenser then it would probably be a non-issue from the BATF's perspective.
But the idea that a silencer made for a muzzle loader or airgun but that will still work on a firearm is going to be unregulated just because the person who possesses it SAYS it's for a muzzle loader or airgun isn't going to fly. Oddly enough, people caught with their hand in the cookie jar often claim that they're innocent and come up with creative explanations to support their claim. This means that the justice system tends to be very skeptical about such claims.
If the item is a silencer then it MUST be permanently attached to something other than a firearm to gain unregulated status.
And either I’m not doing a good job getting my current point across, or I’m being exceptionally obtuse.
Your point is abundantly obvious. It's not at all hard to understand what you are asking, and you've been given accurate and clear answers as well as lengthy explanations and good examples. As far as I can tell, the only problem you're having is that you're not getting anyone to agree with you.
What makes a silencer
legally not a silencer? PERMANENT ATTACHMENT to something that is not a firearm.
What is an unregistered silencer that is made specifically for a muzzle loader but that is NOT PERMANENTLY ATTACHED to a muzzle loader? A federal felony.
If a part is removed from a silencer, what is it? It is legally a silencer. What if the silencer it came from is permanently attached to a non-firearm? It doesn't matter because silencer parts are regulated as silencers if they are not permanently attached to a non-firearm..
What is an oil filter? It is an oil filter unless it has been adapted, or there is clear intent to adapt it to be a silencer.
What is a lawnmower muffler? It is a lawnmower muffler unless it has been adapted, or there is clear intent to adapt it to be a silencer.
I don’t find this terribly complicated to understand.
Because it's not.
Then you should be able to answer the questions I posed in my previous post.
Go back to my 2 silencer example and study it. It will make this situation very easy to understand.
...let’s forget about the whole permanent attachment part...
It is not possible to discuss this intelligently or accurately without focusing on the "permanent attachment part". Like it or not, that is the crux of the matter.
Let’s pretend this item is made by a separate company whose only product is this moderator that’s specifically designed and intended solely for use on a muzzleloader.
Let's restate this.
Hey, BATF, this thing that looks like a silencer, works like a silencer, and is, in fact, a silencer, shouldn't be regulated as a silencer because I make and sell them and I say they're not silencers.
It doesn't take a lot of thought to understand why it would be totally untenable from the BATF's perspective to accept that kind of an assurance.
Basically it would mean that anyone could make and sell unregulated silencers as long as they claimed they were only for muzzle loaders or airguns AND that it would be legal for anyone to purchase and possess unregulated silencers as long as they claim that they are only going to be used for muzzle loaders or airguns, or aren't going to be used at all.
...the only way it will ever be tested is if someone abuses it, most likely by slapping the silencer onto a modern gun.
It is not necessary to attach a silencer to a firearm to be prosecuted for having an unregistered silencer.
Merely possessing an unregistered silencer is a federal felony--even if it is not attached to a firearm. Even if you have no firearm to attach it to. The ONLY thing that makes possession of an unregistered silencer legal is if the unregistered silencer is permanently attached to something that is not a firearm.