Here is some good info from ATF. Just replace the upper with a 16" upper and go out of state with the gun as long as the SBR upper is not with you, leave it home while out of state. No need to remove the gun from the registry as long as it is not a perm change.
http://www.atf.gov/firearms/faq/nati...moval-from-nfa
Q: Does the installation of a barrel over 16 inches in length (SBR) or 18 inches in length (SBS) remove the firearm from the purview of the NFA? If so, is this considered a permanent change?
Installation of a barrel greater than 16 inches in length (SBR) or 18 inches in length (SBS) will remove the firearm from the purview of the NFA provided the registrant does not maintain control over the parts necessary to reconfigure the firearm as a SBR or SBS.
"Real men have always needed to know what time it is so they are at the airfield on time, pumping rounds into savages at the right time, etc. Being able to see such in the dark while light weights were comfy in bed without using a light required luminous material." -Originally Posted by ramairthree
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