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I should've thought to read that on the Form 1 contents at the end...
Question though still...is there any specific time frame from which you have to change your mind, ask for a refund, and remove it from the registry to sell it as a normal lower?
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It's amazing what people can actually learn from reading the forms the filled out.
I've never seen anything that sets a time limit...not to say there isn't one. There are limits on how old a CLEO signature is for a submission, but not to make the actual firearm.
Obviously the best time would be before you engrave it, but it makes no difference. There's no requirement to remove it from the registry in order to sell it as a "normal" lower. The reality is, it's
always a normal lower...it just may have additional engraving. There's no such thing as an "SBR lower". You can put a 16" upper on it at any time and cross state lines without any 5320.20, or sell it to anybody legal to own a long gun, or hunt in areas where SBRs aren't allowed.
The removing from registry does nothing but keep their registry current. It has zero impact on you or the weapon. The recommend you do it, but can't require it.
For examples, here are two Q&A from the
ATF SBR/SBS FAQ:
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?
A: 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.
Q: Who is responsible for notifying the NFA Branch when I transfer the GCA firearm to a FFL or another individual?
A: There is no requirement that the transferor or transferee of a GCA firearm notify the NFA branch of a transfer or that either party determine whether the firearm was previously registered under the NFA. There is no also no requirement for the registrant or possessor of a NFA firearm to notify ATF of the removal of features that caused the firearm to be subject to the NFA; however, ATF recommends the owner notify the NFA Branch in writing if a firearm is permanently removed from the NFA.
I'd recommend you read through those and bookmark it.
Take note of the use of the word
recommend as opposed to
require...as there are no statutes to require you to notify them of most changes. That doesn't even get I to the discussion of what the definition of "permanent" is in regards to the AR platform.