As can be seen this covers improvised sound suppressors, and component parts of a sound suppressor. There is no thresh hold level of sound reduction for something to fall under this definition. ATF used to require the device “appreciably” lower the sound (see Revenue Ruling 57-38); now the working definition seems to be anything that traps gas from the muzzle of the gun, or from porting of the barrel, is a sound suppressor. In general recoil compensators and flash hiders do not fall under this definition, but some designs could fall into the category. As with any borderline device the thing to do is to get a written opinion from the Technology Branch of ATF. It is what they exist to do.

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