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Expansion chamber- NFA item or no?
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May 23, 2011, 12:33 AM
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David Hineline
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Join Date: December 23, 1999
Location: South Sioux City, Nebraska
Posts: 704
Most likely ok, but the only way to know is to measure the sound.
If your device reduces the sound then ports or not it is a silencer.
David Hineline
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