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Old November 24, 2012, 06:24 PM   #14
Don H
Senior Member
Join Date: May 8, 2000
Location: SLC,Utah
Posts: 2,704
Do threaded barrels and oil filters generally have the same thread pitch or does an adapter (the registered NFA item) have to be used as in the video you linked? If the adapter is, in and of itself, the NFA item, then the filter, by definition, isn't the silencer or a component thereof.
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