Wait just a cotton pickin' second here... Would an airgun suppressor be legal if it were built to absolutely destroy itself if used with a firearm?
Let's say you built an airgun supressor, but made it to only withstand an airgun shot. Let's say that if it were applied to an actual firearm, even just a .22, the silencer would shatter into a million pieces.
Would that be legal?
(I know, it couldn't even reduce the sound by one decibel... damn BATF...)
They might not like that though, since my idea would blow the suppressor tube into a star shape, and it could potentially maim or kill the shooter if they used it on a firearm. I dunno about you guys, but, I'd be unhappy to have a razor sharp piece of metal fly back and hit me in the face, especially at that velocity...