Actually, the ATF recently sent a letter out clarifying that. According to
the letter:
Quote:
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Replacement of any component or component parts of a registered silencer, other than silencer wipes, would be a violation of the NFA if performed by a non-licensed manufacturer.
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The manufacturer offers to repair the filters for a nominal fee, but if the user thinks he can just chuck the filter and replace it with an off-the-shelf one, he could end up in jail.