JRT
NES Member
Yes, you need to start as a pistol in order to go back to pistol after being a rifle or SBR.
I was trying (not well) to highlight that if the gun is not in SBR configuration, then you do not need to treat it as an SBR when traveling. You still need to abide by other regulations about going from pistol-rifle-pistol.
Can you imagine a scenario where the ATF is checking if your AR pistol started life at as a rifle where you're not jacked up for something far worse. When I was a kid I found an old Montgomery Ward side by side in the loft of our barn. I loved it because it was the one gun I could shoot whenever I wanted and I didn't have to clean it each time. I carried that thing everywhere and one day I thought it would be far cooler as a sawed off. I ran a trap line for a least one entire season in its shorty form and it was sitting in my trapping basket and my dad saw it and had a fit. He welded it shut and then cut it into pieces on the bandsaw and screamed at me I could go to prison lol. I wonder how many people unknowingly wanted a pistol AR and just added a brace to a rifle and bought a short upper, I bet its more than just a few.