Online - Firearms - Frequently Asked Questions - National Firearms Act (NFA) - Silencers. Q: What part of a silencer must be marked?
The silencer must be marked in accordance with 27 C.F.R. ยงยง 478.92 and 479.102. The regulations require that the markings be conspicuous and legible, meaning that the markings may be placed on any external part, such as the outer tube or end cap. ATF strongly recommends that manufacturers place all required markings on the outer tube of the silencer, as this is the accepted industry standard.
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