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What i heard was that in order for it to be classified as a "silencer" it has to quiet the bang to or below a certain DB.
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Assuming we're talking about U.S. law then that is incorrect.
There is no distinction in the law between "firearm muffler" and "firearm silencer"
http://www.atf.gov/firearms/guides/i...-silencer.html
"The term “Firearm Silencer” or “Firearm Muffler” means any device for silencing, muffling, or diminishing the report of a portable firearm, including any combination of parts, designed or redesigned, and intended for the use in assembling or fabricating a firearm silencer or firearm muffler, any part intended only for use in such assembly or fabrication."
http://www.gpo.gov/fdsys/pkg/USCODE-...p44-sec921.htm
(24) The terms “firearm silencer” and “firearm muffler” mean any device for silencing, muffling, or diminishing the report of a portable firearm, including any combination of parts, designed or redesigned, and intended for use in assembling or fabricating a firearm silencer or firearm muffler, and any part intended only for use in such assembly or fabrication.
If it diminishes the report then it fits the definition. A silencer that performs very poorly is still a silencer, legally speaking.