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Originally Posted by ATF
The term “Firearm Silencer” or “Firearm Muffler” means 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, any part intended only for use in such assembly or fabrication.
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Quote:
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Originally Posted by David Hineline
If your device reduces the sound then ports or not it is a silencer.
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Not always.
In this pic Tom was shooting using some kind of super long ported barrel extension called a "metro barrel" IIRC. It did reduce the report of his shotgun and the device is not controlled by the NFA.
As to not confuse the issue any more, Pullnshoot, if your muzzle device is the same inside diameter from the crown of the barrel to the muzzle of the extention, with no baffles or anything that might be mistaken for something that is designed for the "muffling or diminishing the report" there should not be any issue. In fact, here is a pic of something like what you were describing in your first post.
