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Old July 14, 2012, 03:50 PM   #6
zippy13
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Join Date: August 23, 2008
Location: SoCal
Posts: 6,392
Typically, to be considered as part of the barrel's legal length, the extension must be permanent. And, there's another consideration, beyond barrel length: Threading the end of the barrel. Many law makers think a threaded barrel is an invitation to attach a silencer. Consequently, pinning threaded barrel devices is common -- it keeps the lawmakers happy and it's less drastic than welding.
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