Silencer.

Silencer. 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, and any part intended only for use in such assembly or fabrication.

Source

32 CFR § 552.126

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Scoping language

For the purpose of this part, the following definitions apply:

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