Are there legal definitions for devices that you put on the end of a barrel? I'm not talking about suppressors, SBR's, or state laws governing flash hiders. I'm talking about an off the shelf rifle of standard length, and a random design muzzle device. If I'm not mistaken, it would become a silencer once it decreases the DB by anything at all. How does one without fancy equipment determine that? So, what I'm really asking, is there a legal definition of things you put on the end of your barrel somewhere? A web search turns up lots of info, but no legal definitions, really.