Concrete answer: A pistol may be reconfigured as a rifle. It is legal to then return it back to a pistol. This is according to the BATF.
SBRs must have a letter from the BATF to be transported out of state in an SBR configuration. An SBR lower does not need such letter of it is not configured with a barrel with a length shorter than 16 inches.
A pistol or rifle registered as an SBR is registered as a short barreled rifle.
No letter is needed to transport a pistol out of state.
You can get this information by researching the BATF regulations.
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