I found the link the BATFE referred me too (day late & a $ short) - so if others following this thread have questions - many can be answered here:
RE: http://www.atf.gov/firearms/faq/national...nspotation
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.
Q: Is it necessary to send notification to ATF and receive acknowledgement that the SBR or SBS has been removed from the purview of the NFA before it may be sold as a GCA firearm?
There is no requirement for the possessor of a registered NFA firearm to notify ATF that the firearm has been removed from the purview of the NFA. However, ATF recommends the possessor notify the NFA Branch of such changes in writing so that the possessor is not mistakenly identified as the owner if the firearm is later used in a crime. If, at the time of transfer, the firearm does not meet the definition of a SBR, it should be transferred without filing the NFA transfer application and without payment of the transfer tax.
Q: May I transfer the receiver of a short-barrel rifle or shotgun to an FFL or to an individual as I would any GCA firearm?
Yes. A weapon that does not meet the definition of a NFA “firearm” is not subject to the NFA and a possessor or transferor needn’t comply with NFA requirements. The firearm is considered a GCA firearm and may be transferred under the provisions of that law.
RE: http://www.atf.gov/firearms/faq/national...nspotation
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.
Q: Is it necessary to send notification to ATF and receive acknowledgement that the SBR or SBS has been removed from the purview of the NFA before it may be sold as a GCA firearm?
There is no requirement for the possessor of a registered NFA firearm to notify ATF that the firearm has been removed from the purview of the NFA. However, ATF recommends the possessor notify the NFA Branch of such changes in writing so that the possessor is not mistakenly identified as the owner if the firearm is later used in a crime. If, at the time of transfer, the firearm does not meet the definition of a SBR, it should be transferred without filing the NFA transfer application and without payment of the transfer tax.
Q: May I transfer the receiver of a short-barrel rifle or shotgun to an FFL or to an individual as I would any GCA firearm?
Yes. A weapon that does not meet the definition of a NFA “firearm” is not subject to the NFA and a possessor or transferor needn’t comply with NFA requirements. The firearm is considered a GCA firearm and may be transferred under the provisions of that law.