Permanently Attached

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sharkbait

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My search fu is weak.

When "permanently" attaching a MB or FH to a barrel to make the overall length 16" does the NFA or ATF define "permanently attached"? If so please give a link or direction where I can find it, I don't want to be standing in front of a judge saying "but some guy on the internet said I could..."
 

Honeybee

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NFA handbook 2.1.3

The ATF procedure for measuring barrel length is to measure from the closed bolt (or breech-face) to
the furthermost end of the barrel or permanently attached muzzle device. Permanent methods of
attachment include full-fusion gas or electric steel-seam welding, high-temperature (1100°F) silver
soldering, or blind pinning with the pin head welded over. Barrels are measured by inserting a dowel rod
into the barrel until the rod stops against the bolt or breech-face. The rod is then marked at the
furthermost end of the barrel or permanently attached muzzle device, withdrawn from the barrel, and
measured.
 

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