In the US, there used to be a device that screwed onto a rifle barrel premitting you to screw a plastic bottle onto the device - I believe those were ruled to be suppressors. Not the kind of thing I'm going to use to clean my rifle with - I'll let some of the smarter folks take that risk.
BATFE can find that just about anything is a suppressor - depends on what evidence that they have to show intent to use it as a suppressor. I suppose that a big bag of cotton candy and a large round cardboard tube could be a suppressor if BATFE has evidence that you tried to mount it on the end of your pistol.
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